K was a streetcar line in Los Angeles, California.

The East Jefferson and 38th Street line opened on February 1, 1913.

[1] It ran from Main Street and Jefferson Avenue to East 38th Street and Ascot Avenue via Jefferson, Central Avenue, and East 38th Street.

The line was discontinued on October 5, 1941 and service from Jefferson and Vermont Avenues to USC was thereafter provided by the U line.

[2] The abandoned section became the basis for the company's bus route 18.