- Charlton Heston as George Taylor
- Roddy McDowall as Dr. Cornelius
- Kim Hunter as Dr. Zira
- Maurice Evans as Dr. Zaius
- James Whitmore as President of the Assembly
- James Daly as Dr. Honorius
- Linda Harrison as Nova
- Robert Gunner as Landon
- Lou Wagner as Lucius
- Woodrow Parfrey as Dr. Maximus
- Jeff Burton as Dodge
- Buck Kartalian as Julius
- Norman Burton as Hunt Leader
- Wright King as Dr. Galen
- Paul Lambert as Minister
- Dianne Stanley as Stewart
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