Line J
# Line J

Line J may refer to:

## Transit

* Line J, a line on the Metrocable in Medellín, Colombia
* J Line, part of the RapidRide bus system in King County, WA
* J Line (Los Angeles Metro), a bus rapid transit line in Los Angeles County, California
* J (Los Angeles Railway), a train line operated 1920–1963
* J Church, a Muni Metro Rail Line in San Francisco, CA
* J Nassau Street Local, part of the J/Z (New York City Subway service)
* Gisors Line J, part of the Transilien Paris-Saint-Lazare

## Other

* j-line, a moduli scheme in elliptic curve arithmetic
