Diana most commonly refers to:

• Diana (name), given name (including a list of people with the name)
• Diana (mythology), ancient Roman goddess of the hunt and wild animals; later associated with the Moon
• Diana, Princess of Wales (1961–1997), formerly Lady Diana Spencer, activist, philanthropist, and member of the British royal family

Diana may also refer to:

• Diana (see), a town and commune in Souk Ahras Province in north-eastern Algeria
• Diana's Peak, the highest point on the island of Saint Helena
• Diana Region, a region in Madagascar
• Diana Veteranorum, an ancient city, former bishopric and present Latin Catholic titular see in Algeria

• Diana, Iraq, a town in Iraqi Kurdistan

• Diana (Rozvadov), an almost abandoned settlement in the Czech Republic
• Diana, Silesian Voivodeship, a village in south Poland
• Diana Fort, an ancient Roman castrum in Serbia
• Diana Park, a small park in Helsinki, Finland
• Diana Strait, a strait in the Kuril Islands, Russia
• Diana, a Roman fort in the Serbian city of Golubac

• Diana, New York, a town in Lewis County, New York, United States
• Diana, Saskatchewan, a ghost town in Canada

• 78 Diana, an asteroid
• Diana (crater), a crater on the Moon

• Diana (pastoral romance), a 1559 text by Jorge de Montemayor
• Diana (Sailor Moon), the future daughter of Artemis and Luna, good friends with Pluto and Chibiusa; named for the goddess
• Wonder Woman's real name, despite having more to do with Greek than Roman mythology
• Diana, a British comics series targeted at young girls, published by DC Thomson from 1963 to 1976

• Diana (2013 film), a British film about Diana, Princess of Wales
• Diana (2018 film), a Spanish psychological thriller
• 4 Hearts, a 2008 Portuguese film developed under the title Diana
• Diana (Lights Out), a character in the 2013 and 2016 films
• Diana "Dayan", a fictional dayan (Indian witch) in the 2013 Indian film Ek Thi Dayan, Diana being a word play on dayan

• Diana (American TV series), a 1973–1974 sitcom starring Diana Rigg
• Diana (British TV series), a 1984 drama starring Patsy Kensit and Jenny Seagrove
• "Diana" (Spooks), 2005, final episode of the 4th series of Spooks, concerning the former Princess of Wales

• Diana (musical), a 2019 musical based on the life of Princess Diana

• Diana (band), a rock group from Toronto, Canada

• Diana!, a 1971 Diana Ross TV special, also released as live album
• Diana (album), a 1980 Chic-produced album by Diana Ross

• "Diana" (Paul Anka song), 1957
• "Diana", a single by Comus from their 1971 album First Utterance
• "Diana", a song by Wayne Shorter from Herbie Hancock's 1977 album Tempest in the Colosseum
• "Diana" (Bryan Adams song), 1984
• "Diana" (One Direction song), 2013
• "Diana" (Pop Smoke song), 2020
• "What Have You Got Planned Tonight, Diana" or just "Diana", Merle Haggard and The Strangers from the 1976 album The Roots of My Raising

• Diana (Vouet), a 1637 painting
• Diana (Renoir painting), an 1867 painting

• Diana (Felderhoff), an 1898 bronze sculpture in Berlin, Germany
• Diana (Wiken), a public art work in Milwaukee, Wisconsin
• Diana (Saint-Gaudens), an 1893 statue, a former New York City landmark
• Diana of Versailles

• Defence Innovation Accelerator for the North Atlantic (DIANA), a NATO organization aiming of facilitate the development of dual-use technologies
• Diana (agricultural machinery), a Greek truck and tractor brand
• Diana (camera), an inexpensive toy box camera popular with art photographers
• DIANA (intermediate language), an IDL-based data structure used in Ada compilers and within the PL/SQL runtime system
• Diana (locomotive), a steam locomotive
• DIANA FEA, a Finite Element Analysis (FEA) solver
• DIANA Mayer & Grammelspacher, a German airgun manufacturer
• Diana Motors Company, a Vintage Era automobile company
• DIANA (DIvisive ANAlysis), a divisive clustering algorithm

• Diana (ship), a list of ships with the name
• Diana (swimwear), a swimwear manufacturer
• Diana monkey, a West African member of the Old World monkey superfamily or Cercopithecidae
• Democratic Renewal (DIANA), a political party in Greece

• Diana Department Store, a chain of department stores in southern Thailand
• All pages with titles beginning with Diana
• Diane (disambiguation)
• Dianism, a form of coitus reservatus which can feature in sex magick