Rosalie Trombley (born circa 1939) is a Canadian former music director of AM Top 40 radio station CKLW, also known as "The Big 8". She was known for her ability to select songs that would later become big hits. At the time, she was one of the few female music directors in AM top 40; Kal Rudman, editor of the Friday Morning Quarterback, a music trade publication, referred to her as "the number one music director in the United States."  Her influence as a music director later led to an annual award being named after her.
Trombley was born in Leamington, Ontario. She worked for Bell Canada while in high school.
Trombley and her then-husband Clayton moved to Windsor, and she was hired in 1963 to work as a part-time switchboard operator and receptionist at CKLW. After becoming familiar with how a top 40 station worked, she accepted a position in the music library, and in the fall of 1968, she was offered a full-time position as CKLW's music director, a job she later attributed to "being in the right place at the right time." 
As music director, her job was to find the songs that listeners liked best; her decision to add a song to CKLW's playlist could influence its success. Known for her "good ears", Trombley was frequently able to predict when an album track had the potential to become a hit single.
CKLW was a Windsor, Ontario based station, but it programmed for the Detroit market in the USA; part of its programming strategy was to downplay the fact that its city of license was Windsor, Ontario, and to present itself as an American station. In the late 1960s and early 1970s, With its 50,000 watt AM signal, CKLW covered Michigan, Ohio, Pennsylvania, Indiana and Illinois, as well as southwestern Ontario, Cleveland and Toledo. In the early 1970s, the station had one of the largest cumulative audiences in North America.
In the 1970s, the CRTC mandated that radio stations follow Canadian Content rules and play a certain percentage of Canadian music. Trombley picked the Canadian records she felt stood the best chance of becoming hits for airplay. In some cases, listener response to the Canadian records the station featured led to an American single release, and occasionally a national hit, as in the case of the Skylark song "Wildflower", playing it for over three months as an album cut before its release as a single. Another example is The Carpenters' 1977 cover of Canadian band Klaatu's "Calling Occupants Of Interplanetary Craft".
With so much Canadian content, the station's American popularity began to fade. Trombley acknowledged in a 1982 Billboard magazine article that her station no longer had the "clout" it once did; but despite that, CKLW continued to play a role in breaking hits.
Trombley served as Music Director of CKLW from 1968–84, through the station's top 40 years and into the era when CKLW changed format to appeal to an older audience. After leaving the station, she worked at WLTI-FM in Detroit and then CKEY in Toronto.
Many recording artists visited Trombley to promote their latest single releases, and the walls of her office were lined with gold records. Among the artists she is credited with helping are Earth, Wind and Fire, Elton John, Kiss, Ted Nugent, The Guess Who, The Poppy Family and Bob Seger. Among the hits that CKLW was first to play were the Guess Who's "These Eyes", and the Main Ingredient's 1972 hit "Everybody Plays the Fool".  She persuaded Elton John to release "Bennie and the Jets" as a single, because she believed, correctly, that it would be a cross-over hit, appealing to both black and white listeners.
Seger wrote about Trombley in his 1973 song "Rosalie" from his Back in '72 album ("She's got the tower, she's got the power / Rosalie"). The song was later covered by Irish band Thin Lizzy, on their 1975 album Fighting and again on their 1978 album Live and Dangerous. Seger wrote it in frustration at not being able to get his songs played on CKLW at that time. CKLW never played "Rosalie", although the song did receive airplay on other Detroit stations, as well as other top-40 outlets as far away as Idaho.
Trombley has granted interviews only occasionally, including for the 1971 WDRQ documentary The History of Detroit Radio and for the 2004 documentary Radio Revolution: The Rise and Fall of the Big 8, produced by Toronto-based Markham Films. Much of the documentary was about her the contributions and influence. The film's co-producer Eugene McNamara noted that unlike others who worked at CKLW, she did not go on to additional successes after her years at the Big 8. "I think it was because she was a woman in a male-dominated environment," McNamara stated.
In April 1992, Trombley was awarded a Lifetime Achievement Award at the first annual Motor City Music Awards, held in Detroit.
The "Rosalie Trombley Award" honours women who have made their mark in broadcasting, and is presented during Canadian Music Week.
Trombley was inducted into the Motor City (Detroit) Rock and Roll Hall of Fame and the Canadian Music Week Broadcaster's Hall of Fame. She is now retired and living in Windsor, Ontario.
On June 14, 2011, a scholarship in Trombley's name was announced by St. Clair College, for their Music Theatre Performance program. On June 16 of that same year, Rosalie received an honorary diploma from the Music Theatre Performance program.
In April 2016, Trombley received the 'Walt Grealis Special Achievement Award' at the 2016 Juno Awards.
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