France's constitutional court has approved the law set to ban wearing the Islamic full veil in public.
The proposed measure had already been passed by parliament. It is due to come into force next spring.
The law makes it illegal to wear garments such as the niqab or burka, which incorporate a full-face veil, anywhere in public.
Under the ban, persons found wearing a full veil in public will face a fine of 150 euros (£130) and/or a citizenship course.
Those found to force women to wear a full veil will face a 30,000-euro fine and a one-year jail term.
A last challenge is possible at the European Court of Human Rights in Strasbourg, where decisions are binding.
There are estimated to be only about 2,000 women wearing the full veil in France.
President Nicolas Sarkozy has backed the ban as part of a wider debate on French identity, but opponents say the government is pandering to far-right voters.
Spain and Belgium are debating similar legislation.