B41

B41 or B-41 may refer to:


 * D41 road (Croatia), a Croatian expressway connecting Vrbovec to the Hungarian border
 * Bundesstraße 41, a federal highway in Germany
 * B41 (New York City bus), a bus route in Brooklyn, New York City, United States
 * B41 nuclear bomb, a thermonuclear weapon deployed by the United States in the early 1960s
 * HLA-B41, an HLA-B serotype
 * B-41 Liberator, an American aircraft during World War II
 * B41, Vietnamese designation of RPG-7 rocket-propelled grenade