B
- Babcock (1909–1913)
- Babcock Electric (1906–1912)
- Baby Moose (1914)
- Bachelle Electric (1900–1903)
- Bacon (1901, 1919–1920)
- Badger (1910–1911)
- Bailey (1907–1910)
- Bailey Electric (1907–1916)
- Baker-Bell (1913)
- Baker & Elberg Electric (1894–1895)
- Baker Electric (1899–1916)
- Balboa (1924–1925)
- Baldner (1900–1903)
- Baldwin (1899–1901)
- Ball Steam (1868, 1902)
- Balzer (1894–1900)
- Banker (1905)
- Bantam (1914)
- Barbarino (1923–1925)
- Bar Harbor (1900–1902)
- Barley (1916–1929)
- Barnes (1907)
- Barnes (1910)
- Barnes Steam Trap (1899)
- Barrows Electric (1895–1899)
- Bates (1904–1905)
- Bauer (1914–1916)
- Bauer (1925–1927)
- Bay State (1907–1908)
- Bay State (1922–1926)
- Beardsley (1914–1917)
- Beebe (1905–1906)
- Beechcraft (1946)
- Beggs (1919–1923)
- Belden (1907–1911)
- Bell (1916–1922)
- Bellefontaine (1908)
- Belmont (1909–1910)
- Belmont (1916)
- Bendix (1908–1909)
- Benham (1914)
- Ben Hur (1917–1918)
- Benner (1909)
- Bentel (1916–1919)
- Berg (1903–1905)
- Berg Electric (1920–1921)
- Bergdoll (1910–1913)
- Berwick Electric (1904)
- Berkshire (1905–1912)
- Berliet (see American Berliet)
- Bertolet (1908–1910)
- Bethlehem (see Ideal)
- Beverly (1904)
- Bi-Autogo (1908–1912)
- Biddle (1915–1922)
- Biesel (1914)
- Bimel (1916–1917)
- Binghamton Electric (1920)
- Binney & Burnham (1901–1902)
- Birch (1916–1923)
- Birmingham (1921–1923)
- Black (1893, 1896–1900)
- Black (1908–1910; Black-Crow 1909-1910)
- Blackhawk (1903)
- Blackhawk (1929–1930)
- Bliss (1906)
- B.L.M. (1906–1907)
- Blomstrom (1902–1903, 1907–1908)
- Blood (1902–1906)
- BMC (1952)
- Boardman (1946)
- Bobbi-Kar (1945–1947)
- Boisselot (1901)
- Borbein (1900, 1904–1909)
- Borland Electric (1910–1916)
- Boss Steam Car (1897–1909)
- Boston-Amesbury (1902–1903)
- Boston High Wheel (1907)
- Bour-Davis (1915–1922)
- Bournonville (see Rotary)
- Bowman (1921–1922)
- Bradfield (1929–1930)
- Bradford (see Holley)
- Bradley (1920–1921)
- Bramwell (1904–1905)
- Bramwell-Robinson (1899–1902)
- Brasie (1914–1916)
- Brazier (1902–1903)
- Brecht (1901–1903)
- Brennan (1902–1908)
- Brew-Hatcher (1904–1905)
- Brewster (1915–1925, 1934–1937)
- Briggs and Stratton (1919–1923)
- Briggs-Detroiter (1912–1917) (see Detroiter)
- Brightwood (see Orson)
- Briscoe (1913–1923)
- Bristol (1903–1904)
- Broc Electric (1909–1916)
- Brogan (1946–1950)
- Brook (1920–1921)
- Brooks Steamer (1927)
- Brown (1914)
- Brown (1916)
- Brown-Burtt (see Cannon)
- Brownie (1916)
- Browniekar (1908–1911)
- Brunn (1906)
- Brush (1907–1912)
- Bryan Steam Car (1918–1923)
- Buckeye (1895)
- Buckmobile (1903–1905)
- Buffalo (1900–1902)
- Buffalo Electric (1912–1915)
- Buffum (1901–1907)
- Buggy Car (1908–1909)
- Bugmobile (1907–1909)
- Burdick (1909)
- Burg (1910–1913)
- Burns (1908–1912)
- Burrows (1914–1915)
- Bush (1916–1924)
- B-Z-T (1915)
Read more about this topic: List Of Defunct Automobile Manufacturers Of The United States