B series

B series may refer to:


 * B series, a term in philosophy introduced by John McTaggart
 * B-series, a type of power series in numerical analysis introduced by John C. Butcher
 * BMC B-series engine, a type of combustion engine
 * Cummins B Series engine, a family of diesel engines
 * Chevrolet/GMC B series, a bus
 * Series B, venture capital funding round
 * Series B banknotes, Irish banknotes
 * Transperth B-series train, a type of electric multiple unit used by Transperth Trains in Perth, Western Australia