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Voice actors returning to reprise their roles in Halo 3 include Jen Taylor as Cortana, David Scully as Sergeant Johnson and the Elites, Keith David as the Arbiter, Tim Dadabo as 343 Guilty Spark, Ron Perlman as Lord Hood, Robert Davi as Rtas ' Vadum, and Steve Downes as the voice of Master Chief.

The game also features new voices, with Terence Stamp and Justis Bolding replacing Halo 2 voice actors Michael Wincott and Julie Benz as the Prophet of Truth and Miranda Keyes respectively.

Additional voices include celebrity presenter Jonathan Ross, Nathan Fillion, Adam Baldwin, Alan Tudyk, Katee Sackhoff, and John DiMaggio.

Members of the Halo machinima Red vs. Blue ( Burnie Burns, Gus Sorola, Matt Hullum, Jason Saldaña, Geoff Ramsey, and Joel Heyman ) have a cameo role.