diff --git a/src/Entities/AccessTokenEntity.php b/src/Entities/AccessTokenEntity.php
new file mode 100644
index 00000000..830c13e1
--- /dev/null
+++ b/src/Entities/AccessTokenEntity.php
@@ -0,0 +1,11 @@
+<?php
+namespace League\OAuth2\Server\Entities;
+
+use League\OAuth2\Server\Entities\Interfaces\AccessTokenEntityInterface;
+use League\OAuth2\Server\Entities\Traits\EntityTrait;
+use League\OAuth2\Server\Entities\Traits\TokenEntityTrait;
+
+class AccessTokenEntity implements AccessTokenEntityInterface
+{
+    use EntityTrait, TokenEntityTrait;
+}
diff --git a/src/Entities/AuthCodeEntity.php b/src/Entities/AuthCodeEntity.php
new file mode 100644
index 00000000..3d2354af
--- /dev/null
+++ b/src/Entities/AuthCodeEntity.php
@@ -0,0 +1,15 @@
+<?php
+namespace League\OAuth2\Server\Entities;
+
+use League\OAuth2\Server\Entities\Interfaces\AuthCodeInterface;
+use League\OAuth2\Server\Entities\Traits\EntityTrait;
+use League\OAuth2\Server\Entities\Traits\TokenEntityTrait;
+
+/**
+ * Class AuthCodeEntity
+ * @package League\OAuth2\Server
+ */
+class AuthCodeEntity implements AuthCodeInterface
+{
+    use EntityTrait, TokenEntityTrait;
+}
diff --git a/src/Entities/ClientEntity.php b/src/Entities/ClientEntity.php
new file mode 100644
index 00000000..a8840250
--- /dev/null
+++ b/src/Entities/ClientEntity.php
@@ -0,0 +1,15 @@
+<?php
+namespace League\OAuth2\Server\Entities;
+
+use League\OAuth2\Server\Entities\Interfaces\ClientEntityInterface;
+use League\OAuth2\Server\Entities\Traits\ClientEntityTrait;
+use League\OAuth2\Server\Entities\Traits\EntityTrait;
+
+/**
+ * Class ClientEntity
+ * @package League\OAuth2\Server
+ */
+class ClientEntity implements ClientEntityInterface
+{
+    use EntityTrait, ClientEntityTrait;
+}
diff --git a/src/Entities/Interfaces/AccessTokenEntityInterface.php b/src/Entities/Interfaces/AccessTokenEntityInterface.php
new file mode 100644
index 00000000..242bc8da
--- /dev/null
+++ b/src/Entities/Interfaces/AccessTokenEntityInterface.php
@@ -0,0 +1,7 @@
+<?php
+namespace League\OAuth2\Server\Entities\Interfaces;
+
+interface AccessTokenEntityInterface extends TokenInterface
+{
+
+}
\ No newline at end of file
diff --git a/src/Entities/Interfaces/AuthCodeEntityInterface.php b/src/Entities/Interfaces/AuthCodeEntityInterface.php
new file mode 100644
index 00000000..2029c305
--- /dev/null
+++ b/src/Entities/Interfaces/AuthCodeEntityInterface.php
@@ -0,0 +1,7 @@
+<?php
+namespace League\OAuth2\Server\Entities\Interfaces;
+
+interface AuthCodeInterface extends TokenInterface
+{
+
+}
diff --git a/src/Entities/Interfaces/ClientEntityInterface.php b/src/Entities/Interfaces/ClientEntityInterface.php
new file mode 100644
index 00000000..c32d1e78
--- /dev/null
+++ b/src/Entities/Interfaces/ClientEntityInterface.php
@@ -0,0 +1,42 @@
+<?php
+namespace League\OAuth2\Server\Entities\Interfaces;
+
+interface ClientEntityInterface
+{
+    /**
+     * Get the client's identifier
+     * @return string
+     */
+    public function getIdentifier();
+
+    /**
+     * Set the client's identifier
+     * @param $identifier
+     */
+    public function setIdentifier($identifier);
+
+    /**
+     * Get the client's secret
+     * @return string
+     */
+    public function getSecret();
+
+    /**
+     * Set the client's secret
+     * @param string $secret
+     * @return string
+     */
+    public function setSecret($secret);
+
+    /**
+     * Get the client's name
+     * @return string
+     */
+    public function getName();
+
+    /**
+     * Set the client's name
+     * @param string $name
+     */
+    public function setName($name);
+}
diff --git a/src/Entities/Interfaces/RefreshTokenEntityInterface.php b/src/Entities/Interfaces/RefreshTokenEntityInterface.php
new file mode 100644
index 00000000..f6c91b97
--- /dev/null
+++ b/src/Entities/Interfaces/RefreshTokenEntityInterface.php
@@ -0,0 +1,17 @@
+<?php
+namespace League\OAuth2\Server\Entities\Interfaces;
+
+interface RefreshTokenEntityInterface extends TokenInterface
+{
+    /**
+     * Set the original access token that the refresh token was associated with
+     * @param \League\OAuth2\Server\Entities\Interfaces\AccessTokenEntityInterface $accessToken
+     */
+    public function setOriginalAccessToken(AccessTokenEntityInterface $accessToken);
+
+    /**
+     * Get the access token that the refresh token was originally associated with
+     * @return \League\OAuth2\Server\Entities\Interfaces\AccessTokenEntityInterface
+     */
+    public function getOriginalAccessToken();
+}
diff --git a/src/Entities/Interfaces/ScopeEntityInterface.php b/src/Entities/Interfaces/ScopeEntityInterface.php
new file mode 100644
index 00000000..b1c40537
--- /dev/null
+++ b/src/Entities/Interfaces/ScopeEntityInterface.php
@@ -0,0 +1,17 @@
+<?php
+namespace League\OAuth2\Server\Entities\Interfaces;
+
+interface ScopeEntityInterface
+{
+    /**
+     * Get the scope's identifier
+     * @return string
+     */
+    public function getIdentifier();
+
+    /**
+     * Set the scope's identifier
+     * @param $identifier
+     */
+    public function setIdentifier($identifier);
+}
diff --git a/src/Entities/Interfaces/TokenInterface.php b/src/Entities/Interfaces/TokenInterface.php
new file mode 100644
index 00000000..22f37d05
--- /dev/null
+++ b/src/Entities/Interfaces/TokenInterface.php
@@ -0,0 +1,79 @@
+<?php
+namespace League\OAuth2\Server\Entities\Interfaces;
+
+interface TokenInterface
+{
+    /**
+     * Get the token's identifier
+     * @return string
+     */
+    public function getIdentifier();
+
+    /**
+     * Set the token's identifier
+     * @param $identifier
+     */
+    public function setIdentifier($identifier);
+
+    /**
+     * Get the token's expiry date time
+     * @return \DateTime
+     */
+    public function getExpiryDateTime();
+
+    /**
+     * Set the date time when the token expires
+     * @param \DateTime $dateTime
+     */
+    public function setExpiryDateTime(\DateTime $dateTime);
+
+    /**
+     * Set the token's owner
+     * @param string     $type       The type of the owner (e.g. "user", "client" or something more specific)
+     * @param string|int $identifier The identifier of the owner
+     */
+    public function setOwner($type, $identifier);
+
+    /**
+     * Get the token owner's type
+     * @return string  The type of owner (e.g. "user", "client" or something more specific)
+     */
+    public function getOwnerType();
+
+    /**
+     * Get the token owner's identifier
+     * @return string|int
+     */
+    public function getOwnerIdentifier();
+
+    /**
+     * Get the client that the token was issued to
+     * @return ClientEntityInterface
+     */
+    public function getClient();
+
+    /**
+     * Set the client that the token was issued to
+     * @param \League\OAuth2\Server\Entities\Interfaces\ClientEntityInterface $client
+     */
+    public function setClient(ClientEntityInterface $client);
+
+    /**
+     * Associate a scope with the token
+     * @param \League\OAuth2\Server\Entities\Interfaces\ScopeEntityInterface $scope
+     */
+    public function addScope(ScopeEntityInterface $scope);
+
+    /**
+     * Get an associated scope by the scope's identifier
+     * @param string $identifier
+     * @return ScopeEntityInterface|null  The scope or null if not found
+     */
+    public function getScopeWithIdentifier($identifier);
+
+    /**
+     * Return an array of scopes associated with the token
+     * @return ScopeEntityInterface[]
+     */
+    public function getScopes();
+}
diff --git a/src/Entities/RefreshTokenEntity.php b/src/Entities/RefreshTokenEntity.php
new file mode 100644
index 00000000..8c5ee6fd
--- /dev/null
+++ b/src/Entities/RefreshTokenEntity.php
@@ -0,0 +1,16 @@
+<?php
+namespace League\OAuth2\Server\Entities;
+
+use League\OAuth2\Server\Entities\Interfaces\RefreshTokenEntityInterface;
+use League\OAuth2\Server\Entities\Traits\EntityTrait;
+use League\OAuth2\Server\Entities\Traits\RefreshTokenTrait;
+use League\OAuth2\Server\Entities\Traits\TokenEntityTrait;
+
+/**
+ * Class RefreshTokenEntity
+ * @package League\OAuth2\Server
+ */
+class RefreshTokenEntity implements RefreshTokenEntityInterface
+{
+    use EntityTrait, TokenEntityTrait, RefreshTokenTrait;
+}
diff --git a/src/Entities/ScopeEntity.php b/src/Entities/ScopeEntity.php
new file mode 100644
index 00000000..01345745
--- /dev/null
+++ b/src/Entities/ScopeEntity.php
@@ -0,0 +1,14 @@
+<?php
+namespace League\OAuth2\Server\Entities;
+
+use League\OAuth2\Server\Entities\Interfaces\ScopeEntityInterface;
+use League\OAuth2\Server\Entities\Traits\EntityTrait;
+
+/**
+ * Class ScopeEntity
+ * @package League\OAuth2\Server
+ */
+class ScopeEntity implements ScopeEntityInterface
+{
+    use EntityTrait;
+}
diff --git a/src/Entities/Traits/ClientEntityTrait.php b/src/Entities/Traits/ClientEntityTrait.php
new file mode 100644
index 00000000..46528f21
--- /dev/null
+++ b/src/Entities/Traits/ClientEntityTrait.php
@@ -0,0 +1,52 @@
+<?php
+namespace League\OAuth2\Server\Entities\Traits;
+
+trait ClientEntityTrait
+{
+    /**
+     * @var string
+     */
+    protected $secret;
+
+    /**
+     * @var string
+     */
+    protected $name;
+
+    /**
+     * Get the client's secret
+     * @return string
+     */
+    public function getSecret()
+    {
+        return $this->secret;
+    }
+
+    /**
+     * Set the client's secret
+     * @param string $secret
+     * @return string
+     */
+    public function setSecret($secret)
+    {
+        $this->secret = $secret;
+    }
+
+    /**
+     * Get the client's name
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * Set the client's name
+     * @param string $name
+     */
+    public function setName($name)
+    {
+        $this->name = $name;
+    }
+}
\ No newline at end of file
diff --git a/src/Entities/Traits/EntityTrait.php b/src/Entities/Traits/EntityTrait.php
new file mode 100644
index 00000000..527506ac
--- /dev/null
+++ b/src/Entities/Traits/EntityTrait.php
@@ -0,0 +1,26 @@
+<?php
+namespace League\OAuth2\Server\Entities\Traits;
+
+trait EntityTrait
+{
+    /*
+     * @var string
+     */
+    protected $identifier;
+
+    /**
+     * @return mixed
+     */
+    public function getIdentifier()
+    {
+        return $this->identifier;
+    }
+
+    /**
+     * @param mixed $identifier
+     */
+    public function setIdentifier($identifier)
+    {
+        $this->identifier = $identifier;
+    }
+}
diff --git a/src/Entities/Traits/RefreshTokenTrait.php b/src/Entities/Traits/RefreshTokenTrait.php
new file mode 100644
index 00000000..06f81808
--- /dev/null
+++ b/src/Entities/Traits/RefreshTokenTrait.php
@@ -0,0 +1,30 @@
+<?php
+namespace League\OAuth2\Server\Entities\Traits;
+
+use League\OAuth2\Server\Entities\Interfaces\AccessTokenEntityInterface;
+
+trait RefreshTokenTrait
+{
+    /**
+     * @var AccessTokenEntityInterface
+     */
+    protected $originalAccessToken;
+
+    /**
+     * Set the original access token that the refresh token was associated with
+     * @param \League\OAuth2\Server\Entities\Interfaces\AccessTokenEntityInterface $accessToken
+     */
+    public function setOriginalAccessToken(AccessTokenEntityInterface $accessToken)
+    {
+        $this->originalAccessToken = $accessToken;
+    }
+
+    /**
+     * Get the access token that the refresh token was originally associated with
+     * @return \League\OAuth2\Server\Entities\Interfaces\AccessTokenEntityInterface
+     */
+    public function getOriginalAccessToken()
+    {
+        return $this->originalAccessToken;
+    }
+}
\ No newline at end of file
diff --git a/src/Entities/Traits/TokenEntityTrait.php b/src/Entities/Traits/TokenEntityTrait.php
new file mode 100644
index 00000000..bcd756bf
--- /dev/null
+++ b/src/Entities/Traits/TokenEntityTrait.php
@@ -0,0 +1,126 @@
+<?php
+namespace League\OAuth2\Server\Entities\Traits;
+
+use League\OAuth2\Server\Entities\Interfaces\ClientEntityInterface;
+use League\OAuth2\Server\Entities\Interfaces\ScopeEntityInterface;
+
+trait TokenEntityTrait
+{
+    /**
+     * @var ScopeEntityInterface[]
+     */
+    protected $scopes = [];
+
+    /**
+     * @var \DateTime
+     */
+    protected $expiryDateTime;
+
+    /**
+     * @var string
+     */
+    protected $ownerType;
+
+    /**
+     * @var string|int
+     */
+    protected $ownerIdentifier;
+
+    /**
+     * @var ClientEntityInterface
+     */
+    protected $client;
+
+    /**
+     * Associate a scope with the token
+     * @param \League\OAuth2\Server\Entities\Interfaces\ScopeEntityInterface $scope
+     */
+    public function addScope(ScopeEntityInterface $scope)
+    {
+        $this->scopes[$scope->getIdentifier()] = $scope;
+    }
+
+    /**
+     * Get an associated scope by the scope's identifier
+     * @param string $identifier
+     * @return ScopeEntityInterface|null  The scope or null if not found
+     */
+    public function getScopeWithIdentifier($identifier)
+    {
+        return (isset($this->scopes[$identifier])) ? $this->scopes[$identifier] : null;
+    }
+
+    /**
+     * Return an array of scopes associated with the token
+     * @return ScopeEntityInterface[]
+     */
+    public function getScopes()
+    {
+        return $this->scopes;
+    }
+
+    /**
+     * Get the token's expiry date time
+     * @return \DateTime
+     */
+    public function getExpiryDateTime()
+    {
+        return $this->expiryDateTime;
+    }
+
+    /**
+     * Set the date time when the token expires
+     * @param \DateTime $dateTime
+     */
+    public function setExpiryDateTime(\DateTime $dateTime)
+    {
+        $this->expiryDateTime = $dateTime;
+    }
+
+    /**
+     * Set the token's owner
+     * @param string     $type       The type of the owner (e.g. "user", "client" or something more specific)
+     * @param string|int $identifier The identifier of the owner
+     */
+    public function setOwner($type, $identifier)
+    {
+        $this->ownerType = $type;
+        $this->ownerIdentifier = $identifier;
+    }
+
+    /**
+     * Get the token owner's type
+     * @return string  The type of owner (e.g. "user", "client" or something more specific)
+     */
+    public function getOwnerType()
+    {
+        return $this->ownerType;
+    }
+
+    /**
+     * Get the token owner's identifier
+     * @return string|int
+     */
+    public function getOwnerIdentifier()
+    {
+        return $this->ownerIdentifier;
+    }
+
+    /**
+     * Get the client that the token was issued to
+     * @return ClientEntityInterface
+     */
+    public function getClient()
+    {
+        return $this->client;
+    }
+
+    /**
+     * Set the client that the token was issued to
+     * @param \League\OAuth2\Server\Entities\Interfaces\ClientEntityInterface $client
+     */
+    public function setClient(ClientEntityInterface $client)
+    {
+        $this->client = $client;
+    }
+}
\ No newline at end of file