Erie ( /ˈɪəri/) is a city located in northwestern Pennsylvania in the United States. Named for the lake and the Native American tribe that resided along its southern shore, Erie is the state's fourth-largest city (after Philadelphia, Pittsburgh and Allentown), with a population of 102,000. Erie's Metropolitan Area consists of approximately 280,000 residents and an Urbanized Area population of approximately 195,000. The city is the seat of government for Erie County.

Erie is near Cleveland, Ohio; Buffalo, New York; and Pittsburgh, Pennsylvania. Once teeming with heavy industry, Erie's manufacturing sector remains prominent in the local economy, though healthcare, higher education, and tourism are emerging as greater economic drivers. Millions visit Erie for water recreation at Presque Isle State Park, as well as attractions like a casino and horse racetrack named for the state park.

Erie is known as the Flagship City because of the presence of Oliver Hazard Perry's flagship Niagara. The city has also been called the Gem City because of the "sparkling" lake. Erie won the All-America City Award in 1972. Erie, Pennsylvania is also occasionally nicknamed colloquilly as The Lake City because of its location on the southern, American shores of Lake Erie, from which the city is named.