The Operative Bricklayers' Society (OBS) was a British New Model Trade Union based in London.

They led a strike in 1851 which won an early finish on Saturdays, and in 1854 succeeded in gaining a wage increase for bricklayers in the capital.

[1] In 1859 the union became embroiled in a dispute with employers over the introduction of a nine-hour working day, and the consequential London builders' strike was led by George Howell.

The People's History Museum in Manchester holds the original emblem painting of the Operative Bricklayers' Society.

It shows the society's work, proudly depicting the bricklayers' trade along with symbols of truth, architecture and science.