List of number-one singles of 1977 (Ireland)
The following is a list of songs that reached number one on the Irish Singles Chart in 1977. The official chart was compiled by Irish Recorded Music Association (IRMA) based on sales data from record retailers across Ireland.
| Date (Week Ending) | Song | Artist(s) |
|---|---|---|
| January 1 | Mama Loo | Les Humphries Singers |
| January 8 | Mama Loo | Les Humphries Singers |
| January 15 | Daddy Cool | Boney M. |
| January 22 | Daddy Cool | Boney M. |
| January 29 | Daddy Cool | Boney M. |
| February 5 | Daddy Cool | Boney M. |
| February 12 | Don't Leave Me This Way | Thelma Houston |
| February 19 | Don't Leave Me This Way | Thelma Houston |
| February 26 | Don't Leave Me This Way | Thelma Houston |
| March 5 | Don't Leave Me This Way | Thelma Houston |
| March 12 | Don't Leave Me This Way | Thelma Houston |
| March 19 | When I Need You | Leo Sayer |
| March 26 | When I Need You | Leo Sayer |
| April 2 | When I Need You | Leo Sayer |
| April 9 | When I Need You | Leo Sayer |
| April 16 | When I Need You | Leo Sayer |
| April 23 | Lucille | Kenny Rogers |
| April 30 | Lucille | Kenny Rogers |
| May 7 | Lucille | Kenny Rogers |
| May 14 | Lucille | Kenny Rogers |
| May 21 | Lucille | Kenny Rogers |
| May 28 | Lucille | Kenny Rogers |
| June 4 | Silver Lady | David Soul |
| June 11 | Silver Lady | David Soul |
| June 18 | Silver Lady | David Soul |
| June 25 | Silver Lady | David Soul |
| July 2 | Silver Lady | David Soul |
| July 9 | Silver Lady | David Soul |
| July 16 | I Don't Want to Talk About It | Rod Stewart |
| July 23 | I Don't Want to Talk About It | Rod Stewart |
| July 30 | I Don't Want to Talk About It | Rod Stewart |
| August 6 | I Don't Want to Talk About It | Rod Stewart |
| August 13 | I Don't Want to Talk About It | Rod Stewart |
| August 20 | I Don't Want to Talk About It | Rod Stewart |
| August 27 | Angelo | Brotherhood of Man |
| September 3 | Angelo | Brotherhood of Man |
| September 10 | Angelo | Brotherhood of Man |
| September 17 | Angelo | Brotherhood of Man |
| September 24 | Angelo | Brotherhood of Man |
| October 1 | Way Down | Elvis Presley |
| October 8 | Way Down | Elvis Presley |
| October 15 | Way Down | Elvis Presley |
| October 22 | Way Down | Elvis Presley |
| October 29 | Way Down | Elvis Presley |
| November 5 | Knowing Me, Knowing You | ABBA |
| November 12 | Knowing Me, Knowing You | ABBA |
| November 19 | Mull of Kintyre | Wings |
| November 26 | Mull of Kintyre | Wings |
| December 3 | Mull of Kintyre | Wings |
| December 10 | Mull of Kintyre | Wings |
| December 17 | Mull of Kintyre | Wings |
| December 24 | Mull of Kintyre | Wings |
| December 31 | Mull of Kintyre | Wings |