diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Admin.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Admin.java
index ddacacc..6bc012f 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Admin.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Admin.java
@@ -2,6 +2,7 @@ package hackathon.FrisbYEE.jpa.metier;
 
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.Id;
+import jakarta.persistence.OneToOne;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
@@ -20,6 +21,9 @@ public class Admin {
     private Long id;
     private String name;
 
+    @OneToOne(mappedBy = "admin")
+    private User user;
+
     public Admin(String name){
         this.name = name;
     }
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Athlete.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Athlete.java
index 42235e4..3ca7460 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Athlete.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Athlete.java
@@ -3,6 +3,7 @@ package hackathon.FrisbYEE.jpa.metier;
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.Id;
 import jakarta.persistence.ManyToMany;
+import jakarta.persistence.OneToOne;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
@@ -32,6 +33,9 @@ public class Athlete {
     @ManyToMany(mappedBy = "athletes")
     private List<Session> sessions = new ArrayList<>(); // plusieurs sessions sont possibles
 
+    @OneToOne(mappedBy = "athlete")
+    private User user;
+
     public Athlete(String name){
         this.name = name;
     }
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Coach.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Coach.java
index 6294ab9..ed8f2bd 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Coach.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Coach.java
@@ -3,6 +3,7 @@ package hackathon.FrisbYEE.jpa.metier;
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.Id;
 import jakarta.persistence.OneToMany;
+import jakarta.persistence.OneToOne;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
@@ -26,6 +27,9 @@ public class Coach {
     @OneToMany(mappedBy = "coach")
     private List<Session> sessions = new ArrayList<>(); // Un coach peut avoir plusieurs sessions
 
+    @OneToOne(mappedBy = "coach")
+    private User user;
+
     public Coach(String name){
         this.name = name;
     }
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Role.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Role.java
new file mode 100644
index 0000000..dbdc97e
--- /dev/null
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Role.java
@@ -0,0 +1,7 @@
+package hackathon.FrisbYEE.jpa.metier;
+
+public enum Role {
+    ADMIN,
+    COACH,
+    ATHLETE
+}
\ No newline at end of file
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/User.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/User.java
new file mode 100644
index 0000000..2141d66
--- /dev/null
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/User.java
@@ -0,0 +1,61 @@
+package hackathon.FrisbYEE.jpa.metier;
+
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import jakarta.persistence.OneToOne;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+import java.io.Serializable;
+import jakarta.persistence.Access;
+import jakarta.persistence.AccessType;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.EnumType;
+import jakarta.persistence.Enumerated;
+import jakarta.persistence.CascadeType;
+
+@Entity
+@Getter @Setter @NoArgsConstructor
+@Access(AccessType.FIELD)
+
+public class User implements Serializable {
+
+    @Id
+    @GeneratedValue
+    private Long id;
+    @Column(unique = true, nullable = false) //pas possible d'avoir le même nom
+    private String name;
+    @Column (nullable = false)
+    private String motDePasse;
+    private String email;
+
+    @Enumerated(EnumType.STRING)
+    @Column(nullable = false)
+    private Role role;
+
+    @OneToOne(cascade = CascadeType.ALL)
+    private Coach coach;
+
+    @OneToOne(cascade = CascadeType.ALL)
+    private Athlete athlete;
+
+    @OneToOne(cascade = CascadeType.ALL)
+    private Admin admin;
+
+    public User(String name) {
+        this.name = name;
+    }
+
+    public User(String name, String motDePasse, String email, Role role) {
+        this.name = name;
+        this.motDePasse = motDePasse;
+        this.email = email;
+        this.role = role;
+    }
+
+    @Override
+    public String toString() {
+        return "User [id=" + id + " , name=" + name + "]";
+    }
+}