Topshop (stylised in all caps; originally Top Shop) is a British online fast-fashion retailer, which specialises in women's clothing, shoes and accessories. It is majority owned by Danish company, Bestseller.

In 2024, ASOS sold 75% of Topshop and Topman to Bestseller.

Previously, it was part of the Arcadia Group, controlled by Sir Philip Green, but went into administration in late 2020 before being purchased by ASOS on 1 February 2021. It previously had approximately 510 shops worldwide, but closed all of its physical locations and operated solely via online retail from 2020 to 2025. It will return to physical retail on 21 August 2025, at McElhinney's Department Store in Ballybofey, Ireland.^{[needs update]}

Topshop started as a brand extension of the department store Peter Robinson in the 1960s and originally sold fashion by young British designers, such as Mary Quant and Stirling Cooper. Peter Robinson was a women's fashion chain that had been acquired by Burton in 1946. Topshop was founded in 1964 as Peter Robinson's Top Shop, a youth brand within the Sheffield branch and also had a large department in the Oxford Street shop. This was high fashion for the "young and different generation" as The Times put it in 1965, and the department stocked garments by names such as Mary Quant and Gerald McCann. By 1966, it had a branch in the Peter Robinson store in Norwich.

Peter Robinson's Top Shop buyer Diane Wadey had an eye for young talent and introduced Royal College of Art graduate Jane Whiteside to Jeff Cooper and Ronnie Stirling. The Stirling Cooper brand they created soon had its own sections in Top Shop shops in London and Sheffield, as well as being stocked in Peter Robinson stores in Norwich and Bristol. Other brands stocked at Top Shop included Jeff Banks, French Connection and Radley Cooper.

In 1973, parent company Burton Group launched a major expansion of its womenswear division, splitting Top Shop by Peter Robinson into two chains to be known as Peter Robinson and Top Shop. It was announced that while Peter Robinson would target the over 25s market, Top Shop would focus on the age range from 13 to 24, with Ralph Halpern directing the new venture. By 1974, Peter Robinson had been reduced from 22 stores to six, while Top Shop was developing independently (still retaining the one co-branded shop in Oxford Street) and was described as "highly profitable". Its key retail rivals included Miss Selfridge and the Way In boutique arm of Harrods. Within two years, Top Shop had 55 standalone branches, with more to come according to an article in The Times. Fashion editor Prudence Glynn described it as having a: "sharp definition of purpose". It made profits of £1m that year. By 1978, Top Shop accounted for a third of Burton's operating profits.

Also in 1978, Burton embarked on a drive to win a larger share of the men's fashion market in the midst of declining sales of men's tailoring, launching the Topman brand along similar lines to its women's retail arm. It was described by an executive as: "more of a 'brother to Top Shop than a son of Burton'." The following year, Burton announced sales and profits up by 30 per cent in womenswear, with Topman also being cited as highly profitable. By the start of the 1980s, the brand was being referred to as Topshop.

In the 1980s, Topshop struggled to maintain its profile as a fashion brand, but by the late 1990s it began undergoing a revival. In 1994, it launched a collection with Red or Dead. It continued to work with designer talent, such as former Clements Ribeiro assistant Markus Lupfer – described in 1999 as "so hot he's practically steaming" – also working with, among others, Hussein Chalayan, Tristan Webber and Tracey Boyd. Typically, such ranges sold out quickly, and attracted column inches in the fashion press.