Graham Hamilton Lyle (born 11 March 1944, Bellshill, Lanarkshire, Scotland) is a Scottish singer-songwriter, guitarist and producer.
Between 1970 and 1997, he co-wrote 18 British Top 40 hits, 9 Billboard Hot 100 entries, 4 US Country No.1s and 1 US Adult Contemporary No.1, as well as 3 Australian chart-toppers. His songwriting collaborators have included Terry Britten, Albert Hammond, Troy Seals, Jim Diamond and his long-time performing partner, Benny Gallagher.
His most famous composition is Tina Turner's 1984 US chart-topper and international smash, "What's Love Got to Do with It?", which reached No.1 in the US, Canada and Australia and won him the Song of the Year Grammy. He is also well known in Britain, Continental Europe and the Commonwealth as a member of Gallagher and Lyle, McGuinness Flint and Ronnie Lane's band Slim Chance.