- August 1, 2003 – Marie Trintignant, French actress (b. 1962)
- August 4, 2003 – Frederick Chapman Robbins, American pediatrician and virologist, recipient of the Nobel Prize in Physiology or Medicine (b. 1916)
- August 9, 2003 – Gregory Hines, American dancer and actor (cancer)(b. 1946)
- August 11, 2003 – Armand Borel, Swiss mathematician (b. 1923)
- August 11, 2003 – Herb Brooks, coach of the 1980 Miracle on Ice US Hockey team (b. 1937)
- August 14, 2003 – Helmut Rahn, German footballer (b. 1929)
- August 16, 2003 – Idi Amin, Ugandan dictator
- August 19, 2003 – Sérgio Vieira de Mello, Brazilian diplomat (b. 1948)
- August 19, 2003 – Carlos Roberto Reina, President of Honduras (b. 1926)
- August 23, 2003 – Bobby Bonds, baseball player and manager (b. 1946)
- August 29, 2003 – Vladimir Vasicek, Czech painter (b. 1919)
- August 30, 2003 – Charles Bronson, American actor (b. 1921)
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