Marta may refer to:

• Marta is the dubbed English name for Martel of Fullmetal Alchemist
• Marta Vieira da Silva (born 1986), a Brazilian women's football forward
• Marta Estrella, a recurring fictional character from Arrested Development
• Marta Suplicy (born 1945), a Brazilian politician and psychologist
• Marta (given name), a given name for females
• Marta (river), an Italian river that flows into the Tyrrhenian Sea
• Marta, Italy, a comune in the Province of Viterboin the Italian region Latium
• Marta, Nepal, a village development committee in Kalikot District in the Karnali Zone of north-western Nepal
• Metropolitan Atlanta Rapid Transit Authority, the principal rapid-transit system in the Atlanta metropolitan area
• Mountain Area Regional Transit Authority, the third largest regional transit agency in San Bernardino county