BS3
BS3 or BS-3 may refer to :

BS3, a BS postcode area for Bristol, England
BS3, a center drill bit size
100 mm field gun M1944 (BS-3), a 1944 Soviet gun
BisSulfosuccinimidyl suberate, a crosslinker used in biological research
Bežigrad neighbourhood number 3, a living settlement in Ljubljana, Slovenia
B-s3, a variant of the Antonov A-1 aircraft
BS 3, Report on Influence of Gauge Length and Section of Test Bar on the Percentage of Elongation, a British Standard
BS-III Bharat Stage emission standards in India
BS3, a brass right-hand threaded Gas cylinder valve

See also
BS-3A, a Yuri (satellite)