PRL may refer to: Places Polish People's Republic (Polska Rzeczpospolita Ludowa), 1952–1989 Punggol Regional Library, an upcoming regional library in Punggol, Singapore Business and enterprises Penn Eastern Rail Lines, reporting mark Computing and technology Preferred Roaming List, in CDMA phones Proportional reduction in loss, a measure of reliability Protocol-relative link, URLs which do not specify a protocol Organizations Liberal Reformist Party (Dominican Republic) Parti Réformateur Libéral, a former political party in Belgium Party of the Radical Left (Partija radikalne levice), a political party in Serbia Republican Party of Liberty, a conservative political party in France, 1945–1951 Science and healthcare Physical Research Laboratory, India Physical Review Letters, a scientific journal PRL-8-53, Nootropic research chemical Prolactin, a hormone