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This is a list of singles which have reached number one on the Irish Singles Chart in 1973.
| Issue date | Song | Artist | Ref. |
|---|---|---|---|
| 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 | [1] |
| 27 December | [1] |