If You Knew Suzi... is the fifth studio album by American singer Suzi Quatro, released on December 1, 1978, but with a 1979 copyright date. this was still Quatro's highest-charting album in the United States (it peaked at number 37 on the Billboard 200). The album also yielded Quatro's biggest US single hit, a duet with Chris Norman named "Stumblin' In" (which reached number 4 on both the Billboard Hot 100 and the Billboard Adult Contemporary charts. It also had an advertising billboard on Sunset Boulevard.
The credits show the album to be a multinational production: tracks were recorded in Cologne (Germany), Paris (France), and Glendale (California). It was then mixed in California and mastered in London to be distributed by a company based in New York City.
The Associated Press wrote that, "although her new album is straight rock 'n' roll, 'Stumblin' In' is a relaxed-sounding love song, hardly representative of the have a good time, scream and shout rock Miss Quatro has been churning out all these years."
The US and Canadian pressing of the album omitted the Vanda and Young-penned song "Evie" and included "Stumblin' In" in its replacement. When If You Knew Suzi... was re-released as a "two-fer" with the Suzi ... and Other Four Letter Words album, both "Evie" and "Stumblin' In" were included.