diff --git a/packages/core/changelog/@unreleased/pr-6810.v2.yml b/packages/core/changelog/@unreleased/pr-6810.v2.yml
new file mode 100644
index 0000000000..65c6807297
--- /dev/null
+++ b/packages/core/changelog/@unreleased/pr-6810.v2.yml
@@ -0,0 +1,5 @@
+type: fix
+fix:
+  description: '[core] fix: FormGroup sub label dark theme'
+  links:
+  - https://github.com/palantir/blueprint/pull/6810
diff --git a/packages/core/src/components/forms/_form-group.scss b/packages/core/src/components/forms/_form-group.scss
index afd7db4177..df8b924311 100644
--- a/packages/core/src/components/forms/_form-group.scss
+++ b/packages/core/src/components/forms/_form-group.scss
@@ -109,6 +109,7 @@ Styleguide form-group
       }
     }
 
+    .#{$ns}-form-group-sub-label,
     .#{$ns}-form-helper-text {
       color: $pt-dark-text-color-muted;
     }