Sir Jacobus Arnoldus Combrinck Graaff GBE KCMG (4 March 1863 – 5 April 1927), also known as 'Sir James', was a South African cabinet minister, Senator, businessman, and South African Party whip. Jacobus Graaff, younger brother of Sir David Graaff, was born on the Wolfhuiskloof farm near Villiersdorp in 1863. Following his father's death in 1875, he left Villiersdorp to work with his brother David at the Combrinck & Co. butchery in Cape Town. In partnership with his brother he took over the business in 1881. In 1899 he and his brother co-founded and was a partner in the Imperial Cold Storage and Supply Company.