Hap or HAP may refer to:

Natural sciences , a cultivar of Karuka Haplochromine cichlids Hazardous air pollutant Hospital-acquired pneumonia Hydroxylapatite (HAp), a mineral Hypoxia-activated prodrug

Organizations Hap inc. Health Australia Party, a political party Health Alliance Plan, a health insurance agency in Michigan Hospital and Healthsystem Association of Pennsylvania Housing Authority of Portland Humanitarian Accountability Partnership Rights and Justice Party (Turkish: ), a Turkish political party

People Hap (nickname) Helmut Andreas Paul HAP Grieshaber (1909–1981), German artist Henry Augustus Pearson Torrey (1837–1902), American professor of philosophy Phạm Hạp (died 979), a general of the Đinh dynasty of Vietnam

Technology Hap (file format) High-altitude platform Tiger HAP, a helicopter

Other uses "Hap" (poem), in Thomas Hardy's Wessex Poems and Other Verses Hap, an archaic word for luck or fortune hap, ISO 639-3 code for the Hupla language of the Indonesian New Guinea Highlands

See also Haps (disambiguation)