Charles Frederick Worth (13 October 1825 – 10 March 1895) was an English fashion designer who founded the House of Worth, one of the foremost fashion houses of the 19th and early 20th centuries. He is considered by many fashion historians to be the father of haute couture. Worth is also credited with revolutionising the business of fashion.

Established in Paris in 1858, his fashion salon soon attracted European royalty, and where they led monied society followed. An innovative designer, he adapted 19th-century dress to make it more suited to everyday life, with some changes said to be at the request of his most prestigious client Empress Eugénie. He was the first to replace the fashion dolls with live models in order to promote his garments to clients, and to sew branded labels into his clothing; almost all clients visited his salon for a consultation and fitting – thereby turning the House of Worth into a society meeting point. By the end of his career, his fashion house employed 1,200 people and its impact on fashion taste was far-reaching. The Metropolitan Museum of Art has said that his "aggressive self-promotion" earned him the title of the first couturier. Certainly, by 1870, his name was not just known in court circles, but appeared in women's magazines that were read by wide society. He is credited with inventing the hoop skirt and the bustle.

Worth raised the status of dressmaking so that the designer-maker also became arbiter of what women should be wearing. Writing on the history of fashion and, in particular, dandyism, in 2002, George Walden said: "Charles Frederick Worth dictated fashion in France a century and a half before Galliano".

Charles Frederick Worth was born on 13 October 1825 in the Lincolnshire market town of Bourne to William and Ann Worth (née Quincey). Some sources say he was their fifth and final child, and the only child other than his brother, William Worth III, to survive to maturity. Others say he was the family's third child. Charles' father was a solicitor – described as "dissolute" – and left his family in 1836 after ruining its finances, leaving his mother impoverished and without financial support.

At the age of 11, Charles was sent to work in a printer's shop. After a year, he moved to London to become an apprentice at the department store of Swan & Edgar in Piccadilly. Seven years later, Lewis & Allenby, another leading British textiles store, employed Worth.

In 1846, Charles Frederick Worth moved to Paris. He arrived there speaking no French and with £5 in his pocket. By the time his mother Ann Worth died in Highgate, London, in 1852, Worth was a sales assistant at Gagelin-Opigez & Cie, a prestigious Parisian firm that sold silk fabrics to the court dressmakers, also supplying cashmere shawls (then a ubiquitous accessory) and ready-made mantles. It was here that he met Marie Vernet, who became his wife in 1851.

Worth began sewing dresses to complement the shawls at Gagelin. Initially, these were simple designs, but his expert tailoring caught the eye of the store's clients. Eventually, Gagelin granted Worth permission to open a dress department, his first official entrance into the dressmaking world. A 1958 article in The Times published shortly before a centenary exhibition in London to mark the opening of his Paris fashion house noted that the ambitious Englishman's ideas were almost too much for his employers: "The young Worth, full of ideas, was having such a success at Gagelin's that it was felt necessary to restrain his rashness". His obituary, written by a Paris correspondent for The Times explained this comment in somewhat more detail, saying that he was refused a share in the Gagelin business, even though he had extended its activities into making up, rather than just selling, garments. He had also helped build the company's international reputation by exhibiting prize-winning designs at both The Great Exhibition of 1851 in London and the Exposition Universelle in Paris four years later. At the Paris exposition he had displayed a white silk court train embroidered in gold.

With a wife and two sons, Gaston Lucien (1853) and Jean Philippe (1856), Worth was eager to establish himself. By this stage, he was a known name. He acquired a young Swedish business partner, Otto Gustaf Bobergh, and in 1858 the duo set up in business at 7 rue de la Paix, naming the establishment Worth and Bobergh. Marie Vernet Worth played a key role from the start, both in the selling of the clothes and in introducing many new customers.