Francis Nathaniel Tarr (14 August 1887 – 18 July 1915) was an English international rugby union player.
He played centre for the Leicester Tigers and, between 1909 and 1913, won four caps for England, scoring two tries.
He also earned three Blues while reading law at Oxford.
He later became a solicitor in Leicester before volunteering for overseas service during the First World War.
He was killed in July 1915 near Ypres on the Western Front, after being hit by a shell splinter while serving as a lieutenant in the 1/4th Battalion, Leicestershire Regiment.
Tarr was one of 27 former England internationals killed in the war.