Uda or UDA may refer to:

• UD Almería, a Spanish football club
• Unión Deportivo Ascensión, a Peruvian football club
• Ulster Defence Association, a loyalist paramilitary organisation in Northern Ireland
• Union des artistes, a Quebec actors' union
• Union for Democratic Action, an American political organization
• United Democratic Alliance (disambiguation), various political parties
• Urban Development Authority, a department of the Ministry of Urban Development (Sri Lanka)
• University of Atacama (Spanish: Universidad de Atacama)
• UDA Holdings, a Malaysian holding company

• Uda, Argeș, a commune in Argeș County, Romania
• Uda, Nara, a city in Japan
  • Uda District, Nara, Japan
• Uda District, Iwaki, a district of Iwaki Province, Japan during the Nara period
• Wuda District, Wuhai, Inner Mongolia, China (sometimes called Uda District)
• Uda, a village in Tătăruși Commune, Iași County, Romania

• Uda (Khabarovsk Krai), a river in the Russian Far East, flowing into the Sea of Okhotsk
• Uda (Selenga), a tributary of the Selenga in Buryatia, Russia
• Uda River (Uda), a river in Japan; see Shibuya River
• Uda, the name for the upper course of the river Chuna in Irkutsk Oblast, Russia
• Uda, another name for the river Udy, a tributary of the Donets in Ukraine

• Emperor Uda (866–931), Emperor of Japan
• Uda (surname), a surname

• Undocumented alien
• Uda-class oiler, a class of oilers built for the Soviet Navy
• Uda language, a language of Nigeria
• Uda sheep, a breed of sheep
• uda-, a proposed SI unit prefix for 10³⁶.