"If You Love Me (Let Me Know)" is a song written by John Rostill that was a 1974 hit single for Olivia Newton-John. It was her second release to hit the top 10 in the United States, reaching number 5 on the pop chart and number 2 on the Easy Listening chart. It also reached number 2 on the Billboard country chart. As with her single "Let Me Be There", Mike Sammes sings a bass harmony.