B103

B103 may refer to:


 * B103 (New York City bus), bus route in the New York City borough of Brooklyn
 * Bacillus virus B103, a genus of the virus species Picovirinae
 * St. Jerome beside a pollard willow, etching B103 on the list of etchings by Rembrandt
 * B103, a locomotive in the British CIE 101 Class

Radio stations

 * KBWS-FM (102.9 FM, "Superstar Country B103"), in the Sisseton, South Dakota, area
 * WZKR (103.3 FM, formerly broadcast a country format as B103), in the Meridian, Mississippi, area
 * WGFB (103.1 FM, "The New B103 - Today's Lite Rock"), in the Rockton, Illinois, area
 * WWOF (103.1 FM, formerly WAIB, "New Country B103"), in the Tallahassee, Florida, area
 * KBIU (103.3 FM, formerly "B103 The B"), in the Lake Charles, Louisiana, area
 * WFXD (103.3 FM, formerly "B103" under its country format), in the Marquette, Michigan, area
 * CKQQ-FM, (103.1 FM, "B-103"), in the Kelowna, British Columbia, area
 * WBDX (103.1 FM, "The New B103, The Outrageous FM!"), in the Trenton, Georgia, area