WXBU (channel 15) is a television station licensed to Lancaster, Pennsylvania, United States, serving the Susquehanna Valley region as an affiliate of the Spanish-language network Univision.

WXBU's advertising sales office is located on Butler Road in West Cornwall Township; the station shares transmitter facilities with Sinclair-owned, Harrisburg-licensed CBS affiliate WHP-TV (channel 21) on a ridge north of Linglestown Road in Middle Paxton Township.

Originally licensed to Lebanon, it transmitted its signal at one kilowatt on a 572-foot (174 m) tower located just north of Mount Gretna.

On October 16, 1954, the station went off the air after Hurricane Hazel knocked out the power to its transmitter, although they had already filed to go dark on that date with the Federal Communications Commission (FCC).

Triangle changed the station's call letters on New Year's Day 1959 to WLYH-TV (representing its service area of Lebanon, York and Harrisburg).

Later in the 1960s, WHP-TV began airing separate programming outside of network hours, while WLYH and WSBA-TV continued simulcasting for most of the day.

Triangle was forced out of broadcasting in 1970 after then-Governor Milton J. Shapp claimed the company had used its three Pennsylvania television stations (WLYH, WFIL-TV, and WFBG-TV in Altoona) in a smear campaign against him.

[5] WLYH was among the last to be sold, going to Gateway Communications as part of a group deal with WFBG-TV (now WTAJ-TV) and WNBF-TV (now WBNG-TV) in Binghamton, New York, in 1972.

This was mainly because at the time, South Central Pennsylvania was just barely large enough to support what would have essentially been two independent stations.

These two factors made Gateway balk at the added cost of buying an additional 16 hours of programming per day.

On November 1, Clear Channel Communications (which had just bought WHP-TV) entered into a 20-year local marketing agreement with Gateway.

On July 19, 2012, Newport announced the sale of WLYH's LMA partner, WHP-TV, to the Sinclair Broadcast Group.

The LMA with WLYH was included in the deal, and Sinclair also obtained an option to purchase the station's license from Nexstar.

Howard Stirk Holdings revealed in its January 2015 application to purchase Las Vegas station KVMY that it again planned to acquire the WLYH license from Nexstar.

[23] The call letters correspond to the initials of Xavier B. Underwood, a member of the Williams family who also acts as creative director for Howard Stirk Holdings.

[25] WLYH established a full news operation in the early 1960s that focused on the eastern portion (including Lebanon and Lancaster) of its large viewing area.

During the 1960s, WLYH operated a bureau in the W. W. Griest Building in Downtown Lancaster, in addition to its main studios in South Londonderry Township.

This incarnation of WLYH's newscast initially only aired on weeknights before expanding to a seven-night-a-week broadcast at some point in time.