If You Knew Suzi... is the fifth studio album by Suzi Quatro, released at the end of 1978, but with a 1979 copyright date. By August 2012 this was still Quatro's highest-charting album in the United States. 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.

Susan Kay Quatro is an American singer, bass guitarist, songwriter and actor. In the 1970s, she scored a string of singles that found success in Europe and Australia, with both "Can the Can" (1973) and "Devil Gate Drive" (1974) reaching No. 1 in several countries.