This is a list of singles which have reached number one on the Irish Singles Chart in 1973.
| Issue Date | Song | Artist |
|---|---|---|
| 4 January | " Happy Xmas (War Is Over)" | John & Yoko |
| 11 January | " Whiskey In The Jar" | Thin Lizzy |
| 18 January | " Long Haired Lover from Liverpool" | Little Jimmy Osmond |
| 25 January | ||
| 1 February | ||
| 8 February | ||
| 15 February | " Block Buster!" | Sweet |
| 22 February | ||
| 1 March | " I Love You Still" | Big Tom |
| 8 March | ||
| 15 March | " Cum On Feel the Noize" | Slade |
| 22 March | ||
| 29 March | " Get Down" | Gilbert O'Sullivan |
| 5 April | ||
| 12 April | ||
| 19 April | " Tie a Yellow Ribbon Round the Ole Oak Tree" | Dawn featuring Tony Orlando |
| 26 April | ||
| 3 May | ||
| 10 May | ||
| 17 May | ||
| 24 May | ||
| 31 May | " See My Baby Jive" | Wizzard |
| 7 June | " Daisy a Day" | Danny Doyle |
| 14 June | ||
| 21 June | ||
| 28 June | " Rubber Bullets" | 10cc |
| 5 July | ||
| 12 July | " Skweeze Me, Pleeze Me" | Slade |
| 19 July | " Welcome Home" | Peters and Lee |
| 26 July | ||
| 2 August | ||
| 9 August | ||
| 16 August | ||
| 23 August | " Where the 3 Counties Meet" | Brendan Shine |
| 30 August | ||
| 6 September | " Young Love" | Donny Osmond |
| 13 September | ||
| 20 September | " The Dean and I" | 10cc |
| 27 September | " The Ballroom Blitz" | Sweet |
| 4 October | ||
| 11 October | ||
| 18 October | " My Friend Stan" | Slade |
| 25 October | ||
| 1 November | ||
| 8 November | " For The Good Times" | Perry Como |
| 15 November | ||
| 22 November | " Up and Away (The Helicopter Song)" | Wolfe Tones |
| 29 November | ||
| 6 December | ||
| 13 December | ||
| 20 December | " Merry Xmas Everybody" | Slade |
| 27 December |