•
Communist Party of El Salvador (), a political party in El Salvador •
PhillyCarShare, a defunct non-profit organization in Philadelphia, US, acquired by Enterprise in 2011 •
Polish Council of State, supreme political body of Poland from 1947 to 1989 •
Portland Center Stage, a theater company based in Portland, Oregon, US since 1988 •
PotashCorp Corporation of Saskatchewan, a former Canadian producer of potash •
Provo Canyon School, a US psychiatric youth residential treatment center •
Public and Commercial Services Union, a trade union representing UK public sector workers •
Sammarinese Communist Party (), a former political party in San Marino
Education •
Pacific Collegiate School, a grades 7–12 charter school in Santa Cruz, California, US •
Petaluma City Schools, the school district of Petaluma, California, US •
Presbyterian Christian School, a private school in Hattiesburg, Mississippi, US •
Professional Children's School, a college preparatory school for child actors and dancers in New York City, US •
Pueblo City Schools, the school district of Pueblo, Colorado, US ==Science and technology==