The Pennsylvania State Police (PSP) is the state police agency of the U.S. state of Pennsylvania, responsible for statewide law enforcement. The Pennsylvania State Police is a full service law enforcement agency which handles both traffic and criminal law enforcement. The Pennsylvania State Police was founded in 1905 by order of Governor Samuel Pennypacker, by signing Senate Bill 278 on May 2, 1905. The bill was signed in response to the Great Anthracite Strike of 1902. Leading up to the Anthracite Strike, private police forces were used by mine and mill owners to stop worker strikes. The inability or refusal of local police or sheriffs' offices to enforce the law, directly influenced the signing of Bill 278. The Anthracite Strike lasted from May 15 to October 23, 1902, and ended with the help of Theodore Roosevelt, the sitting president at the time.

Samuel Whitaker Pennypacker was an American politician and the 23rd governor of Pennsylvania, serving from 1903 to 1907. A judge assigned to Pennsylvania's Court of Common Pleas system prior to his election as governor, he also researched and wrote about Pennsylvania history.