Charles-Frédéric Mewès (1860–1914) was a French architect and designer.
Born in Alsace, Charles Frédéric Mewès (1858 or 1860-1914) grew up a Parisian after his family fled the Prussian invasion of 1870. RIBA Journal described him as "essentially a big man, both mentally and physically. He was a magnetic personality with a compelling influence tempered by a humorous and tolerant outlook on life". He trained under Jean-Louis Pascal at the École des Beaux-Arts and throughout his career, eschewed Art Nouveau and the Modern style for an elegant, meticulous recall of eighteenth-century France: the logical, spatial symmetry of Louis XVI recurs continuously.
Mewès's hotels, steamer interiors, clubs, and private residences suited the Edwardians' opulent taste. He designed Ritz Hotels in Paris (1898), London (1905-1906), and Madrid (1908-1910); the London Ritz was one of Britain's earliest steel-framed buildings. Subsequently, he undertook the design of Pall Mall's largest club, the Royal Automobile Club (1910) which featured a "Pompeiian" swimming bath adapted from the earlier l'Etablissement Hydrominéral (1899-1900) at Contréxeville. His first maritime interior, the Hamburg-Amerika Line's SS Amerika was completed in 1905; the company so admired it that Mewès became their resident designer. On three German ships he incorporated a Pompeiian pool, although not on his last vessel, Cunard's Aquitania (1914).