List of number-one singles of 1972 (Ireland)
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 " | The New Seekers" |
| 15 January | "I'd Like To Teach The World To Sing " | The New Seekers" |
| 22 January | "The Men Behind the Wire" | Barleycorn |
| 29 January | "The Men Behind the Wire" | Barleycorn |
| 5 February | "The Men Behind the Wire" | Barleycorn |
| 12 February | "Telegram Sam" | T. Rex |
| 19 February | "Telegram Sam" | T. Rex |
| 26 February | "Telegram Sam" | T. Rex |
| 4 March | "Give Ireland Back to the Irish" | Paul McCartney |
| 11 March | "Without You" | Nilsson |
| 18 March | "Ceol An Ghrá" | Sandie Jones |
| 25 March | "Without You" | Nilsson |
| 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" | 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-Doo-Wakka-Day" | Gilbert O'Sullivan |
| 6 July | "Ooh-Wakka-Doo-Wakka-Day" | Gilbert O'Sullivan |
| 13 July | "Ooh-Wakka-Doo-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 |