SL-11 may refer to:
- Schütte-Lanz SL 11, a German military dirigible
- Karosa ŠL 11, a Czech intercity bus, produced from 1970-1981
- Tsyklon-2, a Soviet and Russian rocket, used from 1969-2006
- Tsyklon, a Soviet rocket, used from 1967-1969
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