Thomas Martin Lowry CBE FRS[1] (/ˈlaʊri/; 26 October 1874 – 2 November 1936) was an English physical chemist who developed the Brønsted–Lowry acid–base theory simultaneously with and independently of Johannes Nicolaus Brønsted and was a founder-member and president (1928–1930) of the Faraday Society.

[2] Lowry was born in Low Moor, Bradford, West Riding of Yorkshire, England, in a Cornish family.

He was educated at Kingswood School, Bath, Somerset, and then at the Central Technical College in South Kensington.

[2] In 1898, Lowry noted the change in optical rotation on nitro-d-camphor with time and invented the term mutarotational to describe this phenomenon.

This led in 1923 to his formulation of the protonic definition of acids and bases, now known as Brønsted–Lowry acid–base theory, independently of the work by Johannes Nicolaus Brønsted.