This is a list of singles which topped the Irish Singles Chart in 1970.
Note that prior to 1992, the Irish singles chart was compiled from trade shipments from the labels to record stores, rather than on consumer sales.
| Issue Date | Song | Artist |
|---|---|---|
| 2 January | " Two Little Boys" | Rolf Harris |
| 9 January | ||
| 16 January | ||
| 23 January | ||
| 30 January | ||
| 6 February | " Love Grows (Where My Rosemary Goes)" | Edison Lighthouse |
| 13 February | ||
| 20 February | ||
| 27 February | ||
| 6 March | " Wanderin' Star" | Lee Marvin |
| 13 March | ||
| 20 March | " All Kinds of Everything" | Dana |
| 27 March | ||
| 3 April | ||
| 10 April | ||
| 17 April | ||
| 24 April | ||
| 1 May | ||
| 8 May | ||
| 15 May | ||
| 22 May | " Spirit in the Sky" | Norman Greenbaum |
| 29 May | " Question" | The Moody Blues |
| 5 June | " Yellow River" | Christie |
| 12 June | ||
| 19 June | " 21 Years" | Dermot Hegarty |
| 26 June | ||
| 3 July | " In the Summertime" | Mungo Jerry |
| 10 July | " Goodbye Sam, Hello Samantha" | Cliff Richard |
| 17 July | "In the Summertime" | Mungo Jerry |
| 24 July | ||
| 31 July | " The Wonder of You" | Elvis Presley |
| 7 August | " Lola" | The Kinks |
| 14 August | "The Wonder of You" | Elvis Presley |
| 21 August | ||
| 28 August | ||
| 4 September | "21 Years" | Dermot Hegarty |
| 11 September | ||
| 18 September | ||
| 25 September | " Which Way You Goin' Billy?" | The Poppy Family |
| 2 October | " Band of Gold" | Freda Payne |
| 9 October | ||
| 16 October | ||
| 23 October | ||
| 30 October | ||
| 6 November | ||
| 13 November | " New World in the Morning" | Roger Whittaker |
| 20 November | ||
| 27 November | " I'll Forgive and I'll Try to Forget" | Margo |
| 4 December | "New World in the Morning" | Roger Whittaker |
| 11 December | ||
| 18 December | " If Those Lips Could Only Speak" | Dermot Henry |
| 25 December | " I Hear You Knocking" | Dave Edmunds |