MMDA may refer to:

• Madras Metropolitan Development Authority, former name of Chennai Metropolitan Development Authority
• Metropolitan Manila Development Authority
• MMDA (drug) (3-methoxy-4,5-methylenedioxyamphetamine), a psychedelic drug
• Money Market Deposit Account, also known as Money Market Account
• Metropolitan, municipal and district authority, a collective term to describe the local administrative divisions of Ghana. See Districts of Ghana.