No — in the official adult belt system, ranks begin with white, then blue, purple, brown, and black.
FAQ's
Some academies let adults wear yellow as an intermediate or novelty rank, but it’s not officially recognized in adult competition systems
For kids, it represents a stage of growth and early technical development. For adults, wearing it may simply signal beginner progress before moving to blue.
Treat it like your gi—cold wash and air dry to preserve color and shape. Avoid bleach and dryers for best results.