LTA may refer to:
Science
Lipoteichoic acid Lighter than air, sometimes used in ballooning as in an "LTA pilot license" Linde type A molecular sieve, an aluminosilicate drying agent Light transmission aggregometry, a method for measuring the aggregation of platelets in blood Long-term average, a type of moving average Lymphotoxin alpha
Companies and organizations Business Administration Union, a trade union in Finland Land Transport Authority, a statutory board under the Ministry of Transport of Singapore Lawn Tennis Association in the United Kingdom League of Legends Championship of The Americas, a former esports league for League of Legends Learning Through Art, an educational program of the Guggenheim Museum in New York Lambda Theta Alpha, Latin Sorority, Incorporated Línea Turística Aereotuy, a Venezuelan airline
Other uses Lieutenant in Singapore Civil Defence Legs, Trunk, Arms, now PR3, an adaptive rowing classification Long Term Agreement, a.k.a. Frame contract Framework agreement Louis Troy Austin (born 1991), English singer