WTA may refer to:
- War of the Triple Alliance, also known as the Paraguayan War, a war between Paraguay and the allied Argentina, Brazil and Uruguay
- Washington Trails Association
- Waskahegan Trail Association, the management board for the Waskahegan Trail
- Water Transit Authority, former name of the San Francisco Bay Area Water Emergency Transportation Authority
- Werewolf: The Apocalypse, a role-playing game by White Wolf Publishing
- Whatcom Transportation Authority, a bus agency in Washington State, USA
- Wichita Terminal Association, a railroad
- Wilco (The Album), an album by Wilco
- Willingness to accept
- Winner takes all
- Women's Tennis Association
- World Trampolining Association, Founded in 1866 following the founding of the Amateur Athletics Association in 1864
- World Transhumanist Association, former name of Humanity+
- Ward Traditional Academy, an Elementary School of Arizona
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