diff --git a/CHANGELOG.md b/CHANGELOG.md
index d8b505b0d15b..2ca8e3d1b068 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,7 @@ IMPROVEMENTS:
  * client/config: Enable sockaddr templating for `network-interface` attribute. [[GH-10404](https://github.com/hashicorp/nomad/issues/10404)]
  * client/fingerprint: Added support multiple host network aliases for the same interface. [[GH-10104](https://github.com/hashicorp/nomad/issues/10104)]
  * consul: Allow setting `body` field on service/check Consul health checks. [[GH-10186](https://github.com/hashicorp/nomad/issues/10186)]
+ * consul/connect: Added job-submission validation for Connect service and group names [[]()] todo
  * consul/connect: Enable setting `local_bind_address` field on connect upstreams [[GH-6248](https://github.com/hashicorp/nomad/issues/6248)]
  * consul/connect: Automatically populate `CONSUL_HTTP_ADDR` for connect native tasks in host networking mode. [[GH-10239](https://github.com/hashicorp/nomad/issues/10239)]
  * csi: Added support for jobs to request a unique volume ID per allocation. [[GH-10136](https://github.com/hashicorp/nomad/issues/10136)]
diff --git a/nomad/job_endpoint_hook_connect.go b/nomad/job_endpoint_hook_connect.go
index 1e215f6196aa..3ffe07102196 100644
--- a/nomad/job_endpoint_hook_connect.go
+++ b/nomad/job_endpoint_hook_connect.go
@@ -2,6 +2,7 @@ package nomad
 
 import (
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/hashicorp/nomad/client/taskenv"
@@ -442,18 +443,28 @@ func newConnectSidecarTask(service string) *structs.Task {
 
 func groupConnectValidate(g *structs.TaskGroup) (warnings []error, err error) {
 	for _, s := range g.Services {
-		switch {
-		case s.Connect.HasSidecar():
-			if err := groupConnectSidecarValidate(g); err != nil {
-				return nil, err
+		if s.Connect != nil {
+			if s.Name != strings.ToLower(s.Name) {
+				return nil, fmt.Errorf("Consul Connect service name %q in group %q must not contain uppercase characters", s.Name, g.Name)
 			}
-		case s.Connect.IsNative():
-			if err := groupConnectNativeValidate(g, s); err != nil {
-				return nil, err
+
+			if g.Name != strings.ToLower(g.Name) {
+				return nil, fmt.Errorf("Consul Connect group %q with service %q must not contain uppercase characters", g.Name, s.Name)
 			}
-		case s.Connect.IsGateway():
-			if err := groupConnectGatewayValidate(g); err != nil {
-				return nil, err
+
+			switch {
+			case s.Connect.HasSidecar():
+				if err := groupConnectSidecarValidate(g); err != nil {
+					return nil, err
+				}
+			case s.Connect.IsNative():
+				if err := groupConnectNativeValidate(g, s); err != nil {
+					return nil, err
+				}
+			case s.Connect.IsGateway():
+				if err := groupConnectGatewayValidate(g); err != nil {
+					return nil, err
+				}
 			}
 		}
 	}
diff --git a/nomad/job_endpoint_hook_connect_test.go b/nomad/job_endpoint_hook_connect_test.go
index 4b197aedce81..b36b1dc6b012 100644
--- a/nomad/job_endpoint_hook_connect_test.go
+++ b/nomad/job_endpoint_hook_connect_test.go
@@ -610,3 +610,64 @@ func TestJobEndpointConnect_gatewayProxyForBridge(t *testing.T) {
 		//
 	})
 }
+
+func TestJobEndpointConnect_groupConnectValidate(t *testing.T) {
+	t.Run("non-connect service contains uppercase characters", func(t *testing.T) {
+		_, err := groupConnectValidate(&structs.TaskGroup{
+			Name: "group",
+			Services: []*structs.Service{{
+				Name: "Other-Service",
+			}},
+		})
+		require.NoError(t, err)
+	})
+
+	t.Run("connect service contains uppercase characters", func(t *testing.T) {
+		_, err := groupConnectValidate(&structs.TaskGroup{
+			Name: "group",
+			Services: []*structs.Service{{
+				Name: "Other-Service",
+			}, {
+				Name:    "Connect-Service",
+				Connect: new(structs.ConsulConnect),
+			}},
+		})
+		require.EqualError(t, err, `Consul Connect service name "Connect-Service" in group "group" must not contain uppercase characters`)
+	})
+
+	t.Run("non-connect group contains uppercase characters", func(t *testing.T) {
+		_, err := groupConnectValidate(&structs.TaskGroup{
+			Name: "Other-Group",
+			Services: []*structs.Service{{
+				Name: "other-service",
+			}},
+		})
+		require.NoError(t, err)
+	})
+
+	t.Run("connect-group contains uppercase characters", func(t *testing.T) {
+		_, err := groupConnectValidate(&structs.TaskGroup{
+			Name: "Connect-Group",
+			Services: []*structs.Service{{
+				Name: "other-service",
+			}, {
+				Name:    "connect-service",
+				Connect: new(structs.ConsulConnect),
+			}},
+		})
+		require.EqualError(t, err, `Consul Connect group "Connect-Group" with service "connect-service" must not contain uppercase characters`)
+	})
+
+	t.Run("connect group and service lowercase", func(t *testing.T) {
+		_, err := groupConnectValidate(&structs.TaskGroup{
+			Name: "connect-group",
+			Services: []*structs.Service{{
+				Name: "other-service",
+			}, {
+				Name:    "connect-service",
+				Connect: new(structs.ConsulConnect),
+			}},
+		})
+		require.NoError(t, err)
+	})
+}