Christie's is a British auction house founded in 1766 by James Christie. Its main premises are on King Street, St James's in London, and it has additional salerooms in New York, Paris, Hong Kong, Milan, Geneva, Shanghai, and Dubai. It is owned by Groupe Artémis, the holding company of François Pinault. In 2022 Christie's sold US$8.4 billion in art and luxury goods, an all-time high for any auction house. On 15 November 2017, the Salvator Mundi was sold at Christie's in New York for $450 million to Saudi Prince Badr bin Abdullah Al Saud, the highest price ever paid for a painting.

The official company literature states that founder James Christie (1730–1803) conducted the first sale in London on 5 December 1766, and the earliest auction catalogue the company retains is from December 1766. However, other sources note that James Christie rented auction rooms from 1762, and newspaper advertisements for Christie's sales dating from 1759 have also been traced. After his death, Christie's son, James Christie the Younger (1773–1831) took over the business.

Christie's was a public company, listed on the London Stock Exchange, from 1973 to 1999. In 1974, Jo Floyd was appointed chairman of Christie's. He served as chairman of Christie's International plc from 1976 to 1988, until handing over to Lord Carrington, and later was a non-executive director until 1992. Christie's International Inc. held its first sale in the United States in 1977. Christie's growth was slow but steady since 1989, when it had 42% of the auction market.

In 1990, the company reversed a long-standing policy and guaranteed a minimum price for a collection of artworks in its May auctions. In 1996, sales exceeded those of Sotheby's for the first time since 1954. However, profits did not grow at the same pace; from 1993 through 1997, Christie's annual pretax profits were about $60M , whereas Sotheby's annual pretax profits were about $265M for those years.

In 1993, Christie's paid $10.9M for the London gallery Spink & Son, which specialised in Oriental art and British paintings; the gallery was run as a separate entity. The company bought Leger Gallery for $3.3M in 1996, and merged it with Spink to become Spink-Leger. Spink-Leger closed in 2002. To make itself competitive with Sotheby's in the property market, Christie's bought Great Estates in 1995, then the largest network of independent estate agents in North America, changing its name to Christie's Great Estates Inc.

In December 1997, under the chairmanship of Lord Hindlip, Christie's put itself on the auction block, but after two months of negotiations with the consortium-led investment firm SBC Warburg Dillon Read it did not attract a bid high enough to accept. In May 1998, François Pinault's holding company, Groupe Artémis S.A., first bought 29.1 per cent of the company for $243.2M, and subsequently purchased the rest of it in a deal that valued the entire company at $1.2bn. The company has since not been reporting profits, though it gives sale totals twice a year. Its policy, in line with UK accounting standards, is to convert non-UK results using an average exchange rate weighted daily by sales throughout the year.

In 2002, Christie's France held its first auction in Paris.

Like Sotheby's, Christie's became increasingly involved in high-profile private transactions. In 2006, Christie's offered a reported $21M guarantee to the Donald Judd Foundation and displayed the artist's works for five weeks in an exhibition that later won an AICA award for "Best Installation in an Alternative Space". In 2007 it brokered a $68M deal that transferred Thomas Eakins's The Gross Clinic (1875) from the Jefferson Medical College at the Thomas Jefferson University in Philadelphia to joint ownership by the Philadelphia Museum of Art and the Pennsylvania Academy of the Fine Arts. In the same year, the Haunch of Venison gallery became a subsidiary of the company.