diff --git a/internal/configs/test_file.go b/internal/configs/test_file.go
index cbf7c7620e..b902384adf 100644
--- a/internal/configs/test_file.go
+++ b/internal/configs/test_file.go
@@ -8,6 +8,7 @@ import (
 
 	"github.com/hashicorp/hcl/v2"
 	"github.com/hashicorp/hcl/v2/gohcl"
+	"github.com/hashicorp/hcl/v2/hclsyntax"
 
 	"github.com/hashicorp/terraform/internal/addrs"
 	"github.com/hashicorp/terraform/internal/getmodules"
@@ -437,6 +438,16 @@ func decodeTestRunBlock(block *hcl.Block) (*TestRun, hcl.Diagnostics) {
 		NameDeclRange: block.LabelRanges[0],
 		DeclRange:     block.DefRange,
 	}
+
+	if !hclsyntax.ValidIdentifier(r.Name) {
+		diags = append(diags, &hcl.Diagnostic{
+			Severity: hcl.DiagError,
+			Summary:  "Invalid run block name",
+			Detail:   badIdentifierDetail,
+			Subject:  r.NameDeclRange.Ptr(),
+		})
+	}
+
 	for _, block := range content.Blocks {
 		switch block.Type {
 		case "assert":
diff --git a/internal/configs/testdata/config-diagnostics/tests-provider-mismatch/main.tftest.hcl b/internal/configs/testdata/config-diagnostics/tests-provider-mismatch/main.tftest.hcl
index fbd536f519..adf7a650e0 100644
--- a/internal/configs/testdata/config-diagnostics/tests-provider-mismatch/main.tftest.hcl
+++ b/internal/configs/testdata/config-diagnostics/tests-provider-mismatch/main.tftest.hcl
@@ -11,7 +11,7 @@ provider "bar" {
 
 run "default_should_be_fine" {}
 
-run "bit_complicated_still_okay "{
+run "bit_complicated_still_okay" {
 
   providers = {
     foo = foo
diff --git a/internal/configs/testdata/invalid-modules/tests-invalid-run-blocks/main.tf b/internal/configs/testdata/invalid-modules/tests-invalid-run-blocks/main.tf
new file mode 100644
index 0000000000..2c5e585478
--- /dev/null
+++ b/internal/configs/testdata/invalid-modules/tests-invalid-run-blocks/main.tf
@@ -0,0 +1,8 @@
+
+resource "aws_instance" "web" {
+  ami = "ami-1234"
+  security_groups = [
+    "foo",
+    "bar",
+  ]
+}
diff --git a/internal/configs/testdata/invalid-modules/tests-invalid-run-blocks/main.tftest.hcl b/internal/configs/testdata/invalid-modules/tests-invalid-run-blocks/main.tftest.hcl
new file mode 100644
index 0000000000..16bd35eb92
--- /dev/null
+++ b/internal/configs/testdata/invalid-modules/tests-invalid-run-blocks/main.tftest.hcl
@@ -0,0 +1,2 @@
+
+run "contains spaces" {}