EP3

EP3 is the short for the 3rd episode of a certain series. It can also refer to:
 * Prostaglandin receptor EP3
 * EP3 (Kleptones ep)
 * EP03 - a Swedish electric locomotive used by the Polish railway operator PKP
 * Half-Life 2: Episode 3 - an episodic video game sequel under development
 * Lockheed EP-3 - an electronic surveillance turboprop aircraft, operated by the United States Navy
 * Milwaukee Road class EP-3 - a U.S. electric locomotive used by the railway operator Milwaukee Road 1919-1957
 * EP3 Honda Civic - the chassis code for the 2001-2005 Civic Si and Type R