Knock Knock, Who's There by Mary Hopkin first appeared on the Israeli foreign-music chart on 17 May 1970, entering at #7. It peaked at #5 on 24 May 1970. In total it spent 4 weeks on the chart, last charting on 7 Jun 1970. It also made the year-end chart: #14 of 1970.
| Wk | Date | Pos |
|---|---|---|
| 1 | 17 May 1970 | 7 |
| 2 | 24 May 1970 | 5 |
| 3 | 31 May 1970 | 5 |
| 4 | 7 Jun 1970 | 6 |