| State | Sri Lanka |
| Treaty | Outer Space Treaty |
| Action Type | Ratification |
| Depositary | Government of the Russian Federation |
| Date | 18 November 1986 |
| Other Actions | Signature on deposit with London — 10 March 1967 Ratification on deposit with London — 18 November 1986 Ratification on deposit with Washington — 18 November 1986 |