Irene Jessie "Mouse" Brown (née Young; 16 February 1919 – 7 June 2017) was an author and codebreaker who worked at Bletchley Park in Buckinghamshire in Hut 6[1] during the Second World War.

[1] She began working at Bletchley Park in the Government Code and Cypher School in 1942.

[1] Brown wrote a book (in her maiden name) about her time at Bletchley, Enigma Variations: a Memoir of Love and War.

Women formed roughly 75% of the workforce at Bletchley Park.

[5] The book tells of her time in Hut 6, everyday life at “Station X”, her wartime experiences in general and the tragic death of her first husband (Leslie Cairn).