OCMA may refer to:

• Orange County Museum of Art, an art museum in Newport Beach, California
• Orange Coast Musical Arts, a homeschool marching band in Orange County, California
• Oregon Council on Multiracial Affairs, an affiliate of the Association of MultiEthnic Americans in Portland, Oregon
• Oxford Centre for Maritime Archaeology, a research group at Oxford University, England

• Keith Lemon's LemonAid
• Keith Lemon's Lemonaid
• Keith Lemon's Through the Keyhole
• Keith Lemon: The Film
• Keith Leonard Clark
• Keith Lewin
• Keithley Creek
• Keithley Creek, British Columbia
• Keithley Log Cabin Development District
• Keith Liddell
• Keith Lindblom
• Keith Lindsay Stewart
• Keith Linnecor
• Keith Lionel Urban
• Keith Lockhart
• Keith Long
• Keith Loris
• Keith Lowen
• Keith-Lucas
• Keith Lucas
• Keith Lucas (disambiguation)
• Keith-Lucas (surname)
• Keith MacDermott Hampshire
• Keith MacLeod
• Keith MacRae