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