ACAP may refer to:

In conservation:

• Agreement on the Conservation of Albatrosses and Petrels, a legally binding international treaty signed in 2001
• Arctic Council Action Plan, an action plan to eliminate pollution in the Arctic
• Annapurna Conservation Area Project, restricted area in Himalayas mountains, Nepal

In technology:

• Advanced Common Application Platform, a platform intended to provide television consumers with advanced interactive services
• Application Configuration Access Protocol, a protocol which enhances IMAP by allowing the user to set up data for universal access
• Automated Content Access Protocol, a proposed method of providing machine-readable DRM for online content

In other fields:

• Absorptive capacity, a term used within innovation management
• Advance Credit Administration Program, a series of college equivalent courses
• American Council on Alcohol Problems, a federation of 37 state affiliates promoting the reduction of alcohol advertising
• Array of Contemporary American Physicists, see American Institute of Physics
• Association for Community Affiliated Plans, a Medicaid health plan trade association
• Australian College of Applied Psychology, a training organisation