The 89th (Princess Victoria's) Regiment of Foot was a regiment of the British Army, raised on December 3, 1793. Under the Childers Reforms the regiment amalgamated with the 87th (Royal Irish Fusiliers) Regiment of Foot to form the Princess Victoria's (Royal Irish Fusiliers) in 1881.

During the Second World War, 2nd Battalion, formerly the 89th Regiment of Foot, served throughout the Siege of Malta from 1940-1943 with the 4th (Malta) Infantry Brigade, later renumbered 234th Infantry Brigade. The battalion was lost in the Battle of Leros and the Battle of Kos. 

Leros is a Greek island and municipality in the Dodecanese in the southern Aegean Sea. The Battle of Leros was the central event of the Dodecanese Campaign of the Second World War, and is widely used as an alternate name for the whole campaign. The Italian garrison in Leros was strengthened by British forces on September 15, 1943. The battle began with German air attacks on September 26, continued with the landings on November 12, and ended with the capitulation of the Allied forces four days later.