The Commonwealth bogie is a heavy-duty cast-steel railway carriage bogie, or wheel set, introduced in the 1950s. They were widely used under British Rail Mark 1 coaches, as they offered a much smoother ride than earlier designs but was eventually superseded by lighter options, for instance the B4 bogie.

Originally of US design it was built under licence in the UK. Trials began on British Rail in circa 1955, and became standard on later Mark 1 stock, especially sleepers and restaurant cars, where ride quality was important. From circa 1963 they were replaced by the lighter, cheaper, and easier-to-adjust B4 fabricated bogies on new coaches.