This is a list of singles which have reached number one on the Irish Singles Chart in 1972. The chart issue date changed from Saturday to Friday effective in late June.
| Issue Date | Song | Artist |
|---|---|---|
| 1 January | Slaney Valley | Larry Cunningham |
| 8 January | I'd Like To Teach The World To Sing (In Perfect Harmony) | The New Seekers |
| 15 January | I'd Like To Teach The World To Sing (In Perfect Harmony) | The New Seekers |
| 22 January | The Men Behind the Wire | Barleycorn |
| 29 January | Men Behind The Wire | Barleycorn |
| 5 February | Men Behind The Wire | Barleycorn |
| 12 February | Telegram Sam | T. Rex |
| 19 February | Men Behind The Wire | Barleycorn |
| 26 February | Men Behind The Wire | Barleycorn |
| 4 March | Give Ireland Back to the Irish | Paul McCartney |
| 11 March | Without You | Nilsson |
| 18 March | Ceol An Ghrá | Sandie Jones |
| 25 March | Ceol An Ghrá | Sandie Jones |
| 1 April | 3 Leafed Shamrock | John Kerr |
| 8 April | Broken Marriage Vows | Big Tom And The Mainliners |
| 15 April | Broken Marriage Vows | Big Tom And The Mainliners |
| 22 April | Amazing Grace | Pipes and Drums of the Royal Scots Dragoon Guards |
| 29 April | Sunday Bloody Sunday | Paddywagon |
| 6 May | What Do I Do | Sandie, Joe and Dixies |
| 13 May | A Thing Called Love | Johnny Cash |
| 20 May | A Thing Called Love | Johnny Cash |
| 27 May | A Thing Called Love | Johnny Cash |
| 3 June | A Thing Called Love | Johnny Cash |
| 10 June | Metal Guru | T. Rex |
| 16 June | Vincent | Don McLean |
| 22 June | Vincent | Don McLean |
| 29 June | Ooh-Wakka-Do-Wakka-Day | Gilbert O'Sullivan |
| 6 July | Ooh-Wakka-Do-Wakka-Day | Gilbert O'Sullivan |
| 13 July | Ooh-Wakka-Do-Wakka-Day | Gilbert O'Sullivan |
| 20 July | Sylvia's Mother | Dr. Hook & The Medicine Show |
| 27 July | Sylvia's Mother | Dr. Hook & The Medicine Show |
| 3 August | Sylvia's Mother | Dr. Hook & The Medicine Show |
| 10 August | Sylvia's Mother | Dr. Hook & The Medicine Show |
| 17 August | Sylvia's Mother | Dr. Hook & The Medicine Show |
| 24 August | Sylvia's Mother | Dr. Hook & The Medicine Show |
| 31 August | Sylvia's Mother | Dr. Hook & The Medicine Show |
| 7 September | The Gypsy | Dermot Henry |
| 14 September | The Gypsy | Dermot Henry |
| 21 September | Mama Weer All Crazee Now | Slade |
| 28 September | Mama Weer All Crazee Now | Slade |
| 5 October | Children of the Revolution | T. Rex |
| 12 October | Children of the Revolution | T. Rex |
| 19 October | How Can I Be Sure? | David Cassidy |
| 26 October | Clair | Gilbert O'Sullivan |
| 2 November | Mouldy Old Dough | Lieutenant Pigeon |
| 9 November | Clair | Gilbert O'Sullivan |
| 16 November | Clair | Gilbert O'Sullivan |
| 23 November | Clair | Gilbert O'Sullivan |
| 30 November | Clair | Gilbert O'Sullivan |
| 7 December | My Ding-A-Ling | Chuck Berry |
| 14 December | My Ding-A-Ling | Chuck Berry |
| 21 December | Whiskey in the Jar | Thin Lizzy |
| 28 December | Whiskey in the Jar | Thin Lizzy |
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