diff --git a/pkg/models/accounts.go b/pkg/models/accounts.go
index fe22f8d..0c32fa5 100644
--- a/pkg/models/accounts.go
+++ b/pkg/models/accounts.go
@@ -8,18 +8,19 @@ import "time"
 type Account struct {
 	BaseModel
 
-	Name          string        `json:"name"`
-	Nick          string        `json:"nick"`
-	Avatar        string        `json:"avatar"`
-	Description   string        `json:"description"`
-	EmailAddress  string        `json:"email_address"`
-	PowerLevel    int           `json:"power_level"`
-	Posts         []Post        `json:"posts" gorm:"foreignKey:AuthorID"`
-	Attachments   []Attachment  `json:"attachments" gorm:"foreignKey:AuthorID"`
-	LikedPosts    []PostLike    `json:"liked_posts"`
-	DislikedPosts []PostDislike `json:"disliked_posts"`
-	Realms        []Realm       `json:"realms"`
-	ExternalID    uint          `json:"external_id"`
+	Name            string        `json:"name"`
+	Nick            string        `json:"nick"`
+	Avatar          string        `json:"avatar"`
+	Description     string        `json:"description"`
+	EmailAddress    string        `json:"email_address"`
+	PowerLevel      int           `json:"power_level"`
+	Posts           []Post        `json:"posts" gorm:"foreignKey:AuthorID"`
+	Attachments     []Attachment  `json:"attachments" gorm:"foreignKey:AuthorID"`
+	LikedPosts      []PostLike    `json:"liked_posts"`
+	DislikedPosts   []PostDislike `json:"disliked_posts"`
+	RealmIdentities []RealmMember `json:"identities"`
+	Realms          []Realm       `json:"realms"`
+	ExternalID      uint          `json:"external_id"`
 }
 
 type AccountMembership struct {
diff --git a/pkg/models/realms.go b/pkg/models/realms.go
index 370d87b..9520098 100644
--- a/pkg/models/realms.go
+++ b/pkg/models/realms.go
@@ -3,8 +3,17 @@ package models
 type Realm struct {
 	BaseModel
 
-	Name        string `json:"name"`
-	Description string `json:"description"`
-	Posts       []Post `json:"posts"`
-	AccountID   uint   `json:"account_id"`
+	Name        string        `json:"name"`
+	Description string        `json:"description"`
+	Posts       []Post        `json:"posts"`
+	Members     []RealmMember `json:"members"`
+	IsPublic    bool          `json:"is_public"`
+	AccountID   uint          `json:"account_id"`
+}
+
+type RealmMember struct {
+	BaseModel
+
+	RealmID   uint `json:"realm_id"`
+	AccountID uint `json:"account_id"`
 }
diff --git a/pkg/server/realms_api.go b/pkg/server/realms_api.go
index e48c969..1c2f62f 100644
--- a/pkg/server/realms_api.go
+++ b/pkg/server/realms_api.go
@@ -49,13 +49,14 @@ func createRealm(c *fiber.Ctx) error {
 	var data struct {
 		Name        string `json:"name" validate:"required"`
 		Description string `json:"description"`
+		IsPublic    bool   `json:"is_public"`
 	}
 
 	if err := BindAndValidate(c, &data); err != nil {
 		return err
 	}
 
-	realm, err := services.NewRealm(user, data.Name, data.Description)
+	realm, err := services.NewRealm(user, data.Name, data.Description, data.IsPublic)
 	if err != nil {
 		return fiber.NewError(fiber.StatusBadRequest, err.Error())
 	}
@@ -63,6 +64,40 @@ func createRealm(c *fiber.Ctx) error {
 	return c.JSON(realm)
 }
 
+func inviteRealm(c *fiber.Ctx) error {
+	user := c.Locals("principal").(models.Account)
+	realmId, _ := c.ParamsInt("realmId", 0)
+
+	var data struct {
+		AccountID uint `json:"account_id" validate:"required"`
+	}
+
+	if err := BindAndValidate(c, &data); err != nil {
+		return err
+	}
+
+	var realm models.Realm
+	if err := database.C.Where(&models.Realm{
+		BaseModel: models.BaseModel{ID: uint(realmId)},
+		AccountID: user.ID,
+	}).First(&realm).Error; err != nil {
+		return fiber.NewError(fiber.StatusNotFound, err.Error())
+	}
+
+	var account models.Account
+	if err := database.C.Where(&models.Account{
+		BaseModel: models.BaseModel{ID: uint(realmId)},
+	}).First(&account).Error; err != nil {
+		return fiber.NewError(fiber.StatusNotFound, err.Error())
+	}
+
+	if err := services.InviteRealmMember(account, realm); err != nil {
+		return fiber.NewError(fiber.StatusBadRequest, err.Error())
+	} else {
+		return c.SendStatus(fiber.StatusOK)
+	}
+}
+
 func editRealm(c *fiber.Ctx) error {
 	user := c.Locals("principal").(models.Account)
 	id, _ := c.ParamsInt("realmId", 0)
@@ -70,6 +105,7 @@ func editRealm(c *fiber.Ctx) error {
 	var data struct {
 		Name        string `json:"name" validate:"required"`
 		Description string `json:"description"`
+		IsPublic    bool   `json:"is_public"`
 	}
 
 	if err := BindAndValidate(c, &data); err != nil {
@@ -84,7 +120,7 @@ func editRealm(c *fiber.Ctx) error {
 		return fiber.NewError(fiber.StatusNotFound, err.Error())
 	}
 
-	realm, err := services.EditRealm(realm, data.Name, data.Description)
+	realm, err := services.EditRealm(realm, data.Name, data.Description, data.IsPublic)
 	if err != nil {
 		return fiber.NewError(fiber.StatusBadRequest, err.Error())
 	}
diff --git a/pkg/server/startup.go b/pkg/server/startup.go
index 0edae32..999ecd4 100644
--- a/pkg/server/startup.go
+++ b/pkg/server/startup.go
@@ -80,6 +80,7 @@ func NewServer() {
 		api.Get("/realms/me", auth, listOwnedRealm)
 		api.Get("/realms/:realmId", getRealm)
 		api.Post("/realms", auth, createRealm)
+		api.Post("/realms/:realmId/invite", auth, inviteRealm)
 		api.Put("/realms/:realmId", auth, editRealm)
 		api.Delete("/realms/:realmId", auth, deleteRealm)
 	}
diff --git a/pkg/services/posts.go b/pkg/services/posts.go
index cfc4e6f..3750e2c 100644
--- a/pkg/services/posts.go
+++ b/pkg/services/posts.go
@@ -151,6 +151,15 @@ func NewPost(
 
 	var realmId *uint
 	if realm != nil {
+		if !realm.IsPublic {
+			var member models.RealmMember
+			if err := database.C.Where(&models.RealmMember{
+				RealmID:   *realmId,
+				AccountID: user.ID,
+			}).First(&member).Error; err != nil {
+				return post, fmt.Errorf("you aren't a part of that realm")
+			}
+		}
 		realmId = &realm.ID
 	}
 
diff --git a/pkg/services/realms.go b/pkg/services/realms.go
index 9057f56..4dbefcf 100644
--- a/pkg/services/realms.go
+++ b/pkg/services/realms.go
@@ -23,11 +23,15 @@ func ListRealmWithUser(user models.Account) ([]models.Realm, error) {
 	return realms, nil
 }
 
-func NewRealm(user models.Account, name, description string) (models.Realm, error) {
+func NewRealm(user models.Account, name, description string, isPublic bool) (models.Realm, error) {
 	realm := models.Realm{
 		Name:        name,
 		Description: description,
 		AccountID:   user.ID,
+		IsPublic:    isPublic,
+		Members: []models.RealmMember{
+			{AccountID: user.ID},
+		},
 	}
 
 	err := database.C.Save(&realm).Error
@@ -35,9 +39,21 @@ func NewRealm(user models.Account, name, description string) (models.Realm, erro
 	return realm, err
 }
 
-func EditRealm(realm models.Realm, name, description string) (models.Realm, error) {
+func InviteRealmMember(user models.Account, target models.Realm) error {
+	member := models.RealmMember{
+		RealmID:   target.ID,
+		AccountID: user.ID,
+	}
+
+	err := database.C.Save(&member).Error
+
+	return err
+}
+
+func EditRealm(realm models.Realm, name, description string, isPublic bool) (models.Realm, error) {
 	realm.Name = name
 	realm.Description = description
+	realm.IsPublic = isPublic
 
 	err := database.C.Save(&realm).Error