35S or 35-S may refer to:
Wasco State Airport (FAA identifier: 35S), an airport in Sherman County, Oregon, U.S. 35th parallel south, a geographical latitude Rollei 35 S, a 35 mm camera Sulfur-35 (35S), the most stable radioactive isotope of sulfur, used in biochemical research to radioactively label proteins HP 35s, a scientific calculator the 35S promoter from the cauliflower mosaic virus, used for constitutive expression in plants
See also S35 (disambiguation)