B series may refer to:

Transportation

• BMC B-series engine, a type of combustion engine

• Cummins B Series engine, a family of diesel engines

• Chevrolet/GMC B series, a bus

• Transperth B-series train, a type of electric multiple unit used by Transperth Trains in Perth, Western Australia

Other uses

• A series and B series, a term in philosophy introduced by John McTaggart

• Butcher series, a type of power series in numerical analysis introduced by John C. Butcher

• Series B, venture capital funding round

• Series B banknotes, Irish banknotes

See also

• B class (disambiguation)