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