MRTA

MRTA may refer for:


 * Túpac Amaru Revolutionary Movement, Peru (Spanish: Movimiento Revolucionario Túpac Amaru)
 * Marijuana Regulation and Taxation Act, a 2021 New York state law legalizing recreational marijuana
 * Marketable Record Title Act, a law affecting property title muniment
 * Autorité régionale de transport métropolitain, an umbrella organization in Greater Monreal managing road and public transport (English: Metropolitan Regional Transportation Authority)
 * Mass Rapid Transit Authority of Thailand
 * Montachusett Regional Transit Authority, Massachusetts, United States