The IRT Jerome Avenue Line, also unofficially known as IRT Woodlawn Line, is an A Division New York City Subway line mostly along Jerome Avenue in the Bronx. Originally an Interborough Rapid Transit Company-operated route, it was built as part of the Dual Contracts expansion and opened in 1917 and 1918. It is both elevated and underground, with 161st Street–Yankee Stadium being the southernmost elevated station. The line has three tracks from south of the Woodlawn station to the 138th Street–Grand Concourse station. The Woodlawn Line also has a connection to the Jerome Yard, where 4 trains are stored, just north of the Bedford Park Boulevard–Lehman College station.

Jerome Avenue is one of the longest thoroughfares in the New York City borough of the Bronx, New York, United States. The road is 5.6 miles (9.0 km) long and stretches from Concourse to Woodlawn. Both of these termini are with the Major Deegan Expressway which runs parallel to the west. Most of the elevated IRT Jerome Avenue Line runs along Jerome Avenue. The Cross Bronx Expressway interchanges with Jerome and the Deegan. Though it runs through what is now the West Bronx neighborhood, Jerome Avenue is the dividing avenue between nominal and some named "West" and "East" streets in the Bronx; Fifth Avenue, and to a lesser extent, Broadway, also splits Manhattan into nominal "West" and "East" streets.