List of number-one singles of 1978 (Ireland)

This is a list of singles which have reached number one on the Irish Singles Chart in 1978.


 * 17 Number Ones
 * Most weeks at No. 1 (artist): John Travolta (14), Olivia Newton-John (14)
 * Most weeks at No. 1 (song): "You're The One That I Want" - John Travolta and Olivia Newton-John (9)
 * Most No.1s: John Travolta (3), Olivia Newton-John (3)
 * 4 songs from the film Grease reached No. 1: "You're The One That I Want", "Summer Nights", "Sandy" and "Hopelessly Devoted to You"