These are the number-one singles of 1977 according to the Top 100 Singles Chart in Cash Box magazine
| The yellow background indicates the #1 song of 1977. |
| Issue date | Song | Artist |
|---|---|---|
| January 1 | Marilyn McCoo & Billy Davis Jr. | |
| January 8 | ||
| January 15 | Rose Royce | |
| January 22 | ||
| January 29 | Stevie Wonder | |
| February 5 | Manfred Mann's Earth Band | |
| February 12 | Mary MacGregor | |
| February 19 | ||
| February 26 | ||
| March 5 | Barbra Streisand | |
| March 12 | ||
| March 19 | ||
| March 26 | Daryl Hall & John Oates | |
| April 2 | ABBA | |
| April 9 | Rich Girl | Daryl Hall & John Oates |
| April 16 | David Soul | |
| April 23 | Eagles | |
| April 30 | Glen Campbell | |
| May 7 | Leo Sayer | |
| May 14 | ||
| May 21 | ||
| May 28 | Stevie Wonder | |
| June 4 | KC & The Sunshine Band | |
| June 11 | Fleetwood Mac | |
| June 18 | Got To Give It Up (pt. 1) | Marvin Gaye |
| June 25 | Bill Conti | |
| July 2 | Alan O'Day | |
| July 9 | Shaun Cassidy | |
| July 16 | ||
| July 23 | I'm in You | Peter Frampton |
| July 30 | Andy Gibb | |
| August 6 | ||
| August 13 | ||
| August 20 | Emotions | |
| August 27 | ||
| September 3 | ||
| September 10 | Rita Coolidge | |
| September 17 | Don't Stop | Fleetwood Mac |
| September 24 | Meco | |
| October 1 | ||
| October 8 | Debby Boone | |
| October 15 | ||
| October 22 | ||
| October 29 | ||
| November 5 | ||
| November 12 | ||
| November 19 | ||
| November 26 | ||
| December 3 | Crystal Gayle | |
| December 10 | ||
| December 17 | Bee Gees | |
| December 24 | ||
| December 31 |