WJZ-FM (105.7 MHz) is a commercial radio station licensed to Catonsville, Maryland, and serving the Baltimore metropolitan area.

The call letters WJZ-FM were originally used on what is now WPLJ in New York City from its founding in 1948 to 1953 when the station became WABC-FM, alongside WABC-TV and WABC (AM).

Meanwhile, the WJZ call letters have been used in Baltimore since 1957, when WAAM (channel 13) was renamed to WJZ-TV, an ABC Network affiliate that was changed to CBS in 1995.

The station was purchased on March 6, 1968, by Key Broadcasting, which continued the Christian radio format, changing its call sign to WBMD-FM in late 1969.

In 1982, the call letters became WQSR as the station planned to join "Super Radio", a new national adult contemporary music network to be operated by ABC, using noted disc jockeys such as Dan Ingram, Ron Lundy and Jay Thomas.

"X105.7" would fail to compete for urban listeners against WERQ-FM; as a result, CBS Radio flipped WXYV to hot talk on March 10, 2003.

Meanwhile, Infinity Broadcasting saw an unexpected public reaction to the company's decision to change the format of 99.1 FM, located halfway between Washington and Baltimore.

The story was covered by local TV stations for many days afterwards, and mentioned nationally by The Washington Post, Howard Stern and The Today Show.

Media attention was attracted by a public protest in downtown Washington, outside a skate shop where WHFS maintained a remote storefront studio in its last few months.

'HFS was pulled from the airwaves again on February 1, 2007, immediately before KMS on HFS premiered, yet retained the WHFS call letters traditionally associated with the music the station used to broadcast.

WJZ-FM retained WHFS' status as the flagship radio station for Baltimore Orioles baseball and Maryland Terrapins football and men's basketball.

While CBS shareholders retained a 72% ownership stake in the combined company, Entercom was surviving entity, separating WJZ radio (both 105.7 FM and AM 1300) from WJZ-TV.

[19] WJZ-FM is short-spaced to WQXA-FM 105.7 The X (licensed to serve York, Pennsylvania) as they operate on the same channel and the distance between the stations' transmitters is 47 miles (76 km) as determined by FCC rules.