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