WCBS-FM (101.1 FM) is a radio station owned and operated by Audacy, Inc. licensed to New York, New York, and broadcasting a classic hits format. The station's studios are in the combined Audacy facility in the Hudson Square neighborhood in Lower Manhattan, and its transmitter is located at the Empire State Building.

WCBS-FM was one of the first notable oldies stations in the country, with the format dating back to July 7, 1972. Between June 3, 2005, and July 12, 2007, the station aired the automated adult hits format "Jack FM". The new programming was unsuccessful, and WCBS-FM switched back to a personality-driven classic hits format. The station is continually ranked one of the highest-rated stations in the New York market, as well as one of the highest-rated classic hits stations in the United States.

In 1940, during the early days of FM broadcasting, what is now WCBS-FM was allocated an FM frequency and call sign, W67NY, becoming CBS's first FM station. The original transmitter site was located at 500 Fifth Avenue. The allocated frequency changed several times before the station finally went on the air at 46.7 MHz on December 1, 1941. On November 1, 1943, the callsign was changed to WABC-FM for Atlantic Broadcasting Company, the former owner of CBS's AM station (no relation to the present-day WABC). With the reallocation of the FM band, WABC-FM's new frequency became 96.9 MHz; finally, in September 1947 the station became WCBS-FM, and the frequency moved to the current 101.1. This allowed the station to reflect its corporate ownership by the Columbia Broadcasting System or CBS. The transmitter was moved to the Empire State Building in the early 1950s.

For many years, WCBS-FM simulcast its programming with its AM sister station. From the 1940s until the late 1950s, both stations aired a typical network-dominated general entertainment format with comedies, dramas, news and information, sports, talk shows and some music. As these types of radio shows either moved to television or were canceled outright, WCBS and WCBS-FM evolved toward a personality-oriented format featuring news and information, popular music, and sports. As rock and roll became popular, the stations played only softer songs of the genre.

Each of the stations began broadcasting its own programming in 1966. The AM station retained its personality-oriented middle of the road format until August 27, 1967. WCBS-FM initially programmed a younger-leaning easy listening format known as "The Young Sound", playing soft instrumental versions of current pop music songs. This automated format was syndicated to CBS stations across the country and to AFN (American Forces Network). On August 27, 1967, the AM station had to launch its news format (which was not full-time until 1972) on WCBS-FM because a small airplane had crashed into the AM radio tower a few hours earlier.

In 1969, WCBS-FM launched a freeform rock format, which was becoming increasingly popular, and all other CBS-owned FM stations followed suit. For the first time, WCBS-FM would have an airstaff. Bill Brown began his long tenure with the station, and Don K. Reed began his late in 1971; both remained there until 2005. Radio personalities such as Bobby "Wizzard" Wayne, Tom Tyler, Ed Williams, Steve Clark, Roby Yonge, K.O. Bayley (Bob Elliott from WOR-FM), Les Turpin, Bob "Bob-A-Lew" Lewis also briefly joined the WCBS-FM "freeform" format. Besides Bill Brown and Don K. Reed, Wayne and Williams also stayed into the early part of the oldies format.

WCBS-FM was never successful with their rock format, where it competed with stations such as WPLJ and WNEW-FM; these two stations had most of the rock audience. As a result, WCBS-FM switched to oldies on July 7, 1972, becoming one of the first full-time stations in the country to use that format. The change coincided with rival WOR-FM's decision to drop pre-1964 oldies from its playlist a few months prior (as they became WXLO). Johnny Michaels, formerly of WMCA, played the first record, Dion's "Runaround Sue". The entire staff from the rock format remained at the station.

At first, the station focused on rock-and-roll hits from 1955 to 1964 and mixed in some softer hits of the late 1960s and early 1970s, as well as a few then-current songs. WCBS-FM also played a moderate number of adult standards from the rock era. The station played two current hits per hour known as "future gold". By the late 1970s however, the station dropped most of the adult standards, with a few exceptions, and added rock hits from the late 1960s. WCBS-FM's oldies format weathered many trends and corporate moves. By 1979, three FM stations owned by CBS had begun playing disco music. In the course of 1981, all of CBS's FM stations, except for WCBS-FM and their FM station in San Francisco, adopted a CHR format known as "Hot Hits". The oldies format on WCBS-FM continued to be a success.