WTA may refer to:

• War of the Triple Alliance, a war between Paraguay and the alliance of Argentina, Brazil and Uruguay
• San Francisco Bay Area Water Emergency Transportation Authority, formerly the San Francisco Bay Water Transit Authority, a government ferry agency in the San Francisco Bay Area, California
• Whatcom Transportation Authority, a bus agency in Washington State, USA
• Wichita Terminal Association, a railroad
• Wilco (The Album), an album by Wilco
• Women's Tennis Association
• World Transhumanist Association
• Waskahegan Trail Association

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