diff --git a/object/application.go b/object/application.go
index 11caf725..a75fc987 100644
--- a/object/application.go
+++ b/object/application.go
@@ -78,6 +78,7 @@ type Application struct {
 	EnableSamlCompress    bool            `json:"enableSamlCompress"`
 	EnableSamlC14n10      bool            `json:"enableSamlC14n10"`
 	EnableSamlPostBinding bool            `json:"enableSamlPostBinding"`
+	UseEmailAsSamlNameId  bool            `json:"useEmailAsSamlNameId"`
 	EnableWebAuthn        bool            `json:"enableWebAuthn"`
 	EnableLinkWithEmail   bool            `json:"enableLinkWithEmail"`
 	OrgChoiceMode         string          `json:"orgChoiceMode"`
diff --git a/object/saml_idp.go b/object/saml_idp.go
index 3856e816..53252407 100644
--- a/object/saml_idp.go
+++ b/object/saml_idp.go
@@ -65,7 +65,11 @@ func NewSamlResponse(application *Application, user *User, host string, certific
 	assertion.CreateAttr("IssueInstant", now)
 	assertion.CreateElement("saml:Issuer").SetText(host)
 	subject := assertion.CreateElement("saml:Subject")
-	subject.CreateElement("saml:NameID").SetText(user.Name)
+	nameIDValue := user.Name
+	if application.UseEmailAsSamlNameId {
+		nameIDValue = user.Email
+	}
+	subject.CreateElement("saml:NameID").SetText(nameIDValue)
 	subjectConfirmation := subject.CreateElement("saml:SubjectConfirmation")
 	subjectConfirmation.CreateAttr("Method", "urn:oasis:names:tc:SAML:2.0:cm:bearer")
 	subjectConfirmationData := subjectConfirmation.CreateElement("saml:SubjectConfirmationData")
@@ -386,7 +390,7 @@ func GetSamlResponse(application *Application, user *User, samlRequest string, h
 }
 
 // NewSamlResponse11 return a saml1.1 response(not 2.0)
-func NewSamlResponse11(user *User, requestID string, host string) (*etree.Element, error) {
+func NewSamlResponse11(application *Application, user *User, requestID string, host string) (*etree.Element, error) {
 	samlResponse := &etree.Element{
 		Space: "samlp",
 		Tag:   "Response",
@@ -430,7 +434,11 @@ func NewSamlResponse11(user *User, requestID string, host string) (*etree.Elemen
 	// nameIdentifier inside subject
 	nameIdentifier := subject.CreateElement("saml:NameIdentifier")
 	// nameIdentifier.CreateAttr("Format", "urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress")
-	nameIdentifier.SetText(user.Name)
+	if application.UseEmailAsSamlNameId {
+		nameIdentifier.SetText(user.Email)
+	} else {
+		nameIdentifier.SetText(user.Name)
+	}
 
 	// subjectConfirmation inside subject
 	subjectConfirmation := subject.CreateElement("saml:SubjectConfirmation")
@@ -439,7 +447,11 @@ func NewSamlResponse11(user *User, requestID string, host string) (*etree.Elemen
 	attributeStatement := assertion.CreateElement("saml:AttributeStatement")
 	subjectInAttribute := attributeStatement.CreateElement("saml:Subject")
 	nameIdentifierInAttribute := subjectInAttribute.CreateElement("saml:NameIdentifier")
-	nameIdentifierInAttribute.SetText(user.Name)
+	if application.UseEmailAsSamlNameId {
+		nameIdentifierInAttribute.SetText(user.Email)
+	} else {
+		nameIdentifierInAttribute.SetText(user.Name)
+	}
 
 	subjectConfirmationInAttribute := subjectInAttribute.CreateElement("saml:SubjectConfirmation")
 	subjectConfirmationInAttribute.CreateElement("saml:ConfirmationMethod").SetText("urn:oasis:names:tc:SAML:1.0:cm:artifact")
diff --git a/object/token_cas.go b/object/token_cas.go
index 3cd4de5c..2334e371 100644
--- a/object/token_cas.go
+++ b/object/token_cas.go
@@ -281,7 +281,7 @@ func GetValidationBySaml(samlRequest string, host string) (string, string, error
 		return "", "", fmt.Errorf("the application for user %s is not found", userId)
 	}
 
-	samlResponse, err := NewSamlResponse11(user, request.RequestID, host)
+	samlResponse, err := NewSamlResponse11(application, user, request.RequestID, host)
 	if err != nil {
 		return "", "", err
 	}
diff --git a/web/src/ApplicationEditPage.js b/web/src/ApplicationEditPage.js
index 8bba3d37..4a510338 100644
--- a/web/src/ApplicationEditPage.js
+++ b/web/src/ApplicationEditPage.js
@@ -703,6 +703,16 @@ class ApplicationEditPage extends React.Component {
             }} />
           </Col>
         </Row>
+        <Row style={{marginTop: "20px"}}>
+          <Col style={{marginTop: "5px"}} span={(Setting.isMobile()) ? 19 : 2}>
+            {Setting.getLabel(i18next.t("application:Use Email as NameID"), i18next.t("application:Use Email as NameID - Tooltip"))} :
+          </Col>
+          <Col span={1}>
+            <Switch checked={this.state.application.useEmailAsSamlNameId} onChange={checked => {
+              this.updateApplicationField("useEmailAsSamlNameId", checked);
+            }} />
+          </Col>
+        </Row>
         <Row style={{marginTop: "20px"}} >
           <Col style={{marginTop: "5px"}} span={(Setting.isMobile()) ? 19 : 2}>
             {Setting.getLabel(i18next.t("application:Enable SAML POST binding"), i18next.t("application:Enable SAML POST binding - Tooltip"))} :