Longbottom signed for Jack Taylor's Queens Park Rangers from Methley United in 1954, and made his debut in a 3–0 defeat against Leyton Orient in March 1955. QPR finished 15th in the Third Division South in 1954–55. They then posted an 18th-place finish in 1955–56. Taking over Conway Smith's mantle as the club's key attacker, Longbottom finished as the club's top-scorer in 1956–57 with 15 goals, helping the club to a top ten finish. He scored 18 goals in 1957–58 to become the club's top-scorer once again; another tenth-place finish ensured Rangers a place in the restructured Third Division the following season. He hit 20 goals in 1958–59, becoming the club's top-scorer for a third consecutive season. New manager Alec Stock's new signing Brian Bedford then took over as the club's main source of goals, as QPR finished eighth in 1959–60, before finishing third in 1960–61 – missing out on promotion by just one place and two points. Longbottom played at inside-left, and scored 62 goals in 201 league appearances during his seven years at Loftus Road.