People

• Pai (surname) (Devnagri:पै), includes Konkani region of India name origin, plus people with the name
• Pai (Chinese surname), includes Chinese name origin, plus people with the name
• Bae, sometimes spelled "Pae" or "Pai"; includes Korean name origin, plus people with the name

Fictional characters

• Lee Pai Long, fictional character from SNK Playmore's fighting game series Art of Fighting
• Pai Chan, a character in the video game series Virtua Fighter
• Pai (Manga character), "3x3 Eyes", the anime character
• Pie (Tokyo Mew Mew), an antagonist in the manga and anime series Tokyo Mew Mew

Places

• Hong Kong islands
• Ap Chau Mei Pak Tun Pai
• Ap Chau Pak Tun Pai
• Ap Lei Pai
• Ap Tan Pai
• Ap Tau Pai
• Che Lei Pai
• Hau Tsz Kok Pai
• Shui Cham Tsui Pai
• Pai (Pakistan), a small village in the North West Frontier Province in Pakistan where most of the kundi tribesmen live.
• Pai, Thailand, a small town in Mae Hong Son Province, northern Thailand.
• Amphoe Pai, the district around the town
• Pai River
• Pai Airport

Games

• Gwat Pai, Chinese dominoes set
• Zi pai, Chinese card game
• Pai Gow, Chinese gambling game
• Pai gow poker, Americanized version

Kung Fu martial arts styles

• Fu Jow Pai
• Lai Tung Pai
• Nam Pai Chuan
• Pai lum
• Shaolin Nam Pai Chuan
• Tien Shan Pai
• Wah lum pai

Other uses

• Dai Pai Dong, chain of high-end restaurants based in Hong Kong
• Pai Chai University, located in South Korea
• Pai Mu Tan, aka Bai Mu Dan, Chinese white tea
• Pai (Native American tribe), a tribe of native Americans in the Grand Canyon area
• Internet Slang for Pie

Acronyms

• Parachute Association of Ireland, a representative/regulatory body for skydivers in Ireland
• Personality Assessment Inventory, a test given by psychologists
• Photoacoustic Imaging
• Plasminogen activator inhibitor-1
• Plasminogen activator inhibitor-2
• Pre-approval Inspection
• Polyamide-imide, a plastic resin
• PAI Partners, a French private equity firm
• African Independence Party
• Plasminogen activator inhibitor-1 (PAI-1) and Plasminogen activator inhibitor-2, two proteins that inhibit fibrinolysis (breakdown of blood clots)
• Population Action International
• Polyamide-imide, a thermoplastic polymer
• Polyatomic Ion
• Polizia dell'Africa Italiana or the Italian Africa Police
• Psychometric Artificial Intelligence