| Number: | 639 |
| Organ: | SC |
| Date: | 31 July |
| Year: | 1989 |
| Meeting: | 2,873 |
| Code: | S/RES/639 |
| Document: | https://undocs.org/S/RES/639(1989) |
| For: | 15 |
| Abstention: | 0 |
| Against: | 0 |
| Subject: | Israel–Lebanon |
| Result: | Adopted |
United Nations Security Council resolution 639, adopted unanimously on 31 July 1989, after recalling previous resolutions on the topic, as well as studying the report by the Secretary-General on the United Nations Interim Force in Lebanon (UNIFIL) approved in 426 (1978), the Council decided to extend the mandate of UNIFIL for a further six months until 31 January 1990.
The Council then reemphasised the mandate of the Force and requested the Secretary-General to report back on the progress made with regard to the implementation of resolutions 425 (1978) and 426 (1978).