List of Cash Box Top 100 number-one singles of 1978

This list of number-one hits in the U.S. Cash Box Charts in 1978. It was the year of 20 number-one singles.

• The Bee Gees: How Deep Is Your Love 4 weeks (December 17, 1977 - January 13, 1978 )

• 2 weeks ( 14 January to 27 January )

• 4 weeks ( February 4 to March 3 )

• 8 weeks ( March 18 to May 12 )

• 2 weeks ( May 20-June 2 )

• 6 weeks ( June 3 to July 14 )

• 2 weeks ( July 15 to July 28 )

• 2 weeks ( July 29 to August 11 )

• 4 weeks ( August 12 to September 8 )

• 3 weeks ( September 16-October 6 )

• 2 weeks ( October 7 to October 20 )

• 3 weeks ( 21 October to 10 November )

• 2 weeks ( November 11 to November 24 )

• 3 weeks ( November 25 to December 15 )

• 7 weeks (December 16, 1978 - February 2, 1979 )