Catherine Walker (27 June 1945 – 23 September 2010) was a French-born fashion designer based in London.
Born Catherine Marguerite Marie-Therese Baheux in Calais, Departement du Pas-de-Calais, Nord-Pas-de-Calais, France, she was noted for having supplied over 1,000 outfits for Diana, Princess of Wales, who was buried in a black dress designed by Walker.