WTA
WTA can indicate the women's professional tennis organization, a competitive ‘winner‑takes‑all’ format, professional groups in taxidermy or telecommunications, and informal slang for something overly ambitious.
Miscellaneous
Community
Wildlife Trust Alliance
World Transhumanist Association
Washington Tour on Advocacy
Wisconsin Towns Association
Governmental
World Teleport Association
Wire Traceability and Accountability
Withholding Tax Allowance
Whatcom Transportation Authority