R39 may refer to:
- R39 (New York City Subway car)
- R39 (South Africa), a road
- HMS Zealous (R39), a destroyer of the Royal Navy
- R39: Danger of very serious irreversible effects, a risk phrase
- R-39 Rif, a Soviet submarine-launched ballistic missile
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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