Thomas Brooke, 2nd Viscount Alanbrooke (9 January 1920 – 19 December 1972), was a British peer. He was the eldest son of Field Marshal The 1st Viscount Alanbrooke.

From an Ulster Anglo-Irish aristocratic family, Brooke received his education at Wellington College in Berkshire and fought in the Second World War in the Royal Artillery. He was a writer and a water colour artist. He was unmarried and the viscountcy passed to his half-brother, Victor. Upon the death of the 3rd Viscount in 2018, the viscountcy became extinct.^[1]