- David Strathairn as Edward R. Murrow, journalist and host of the CBS television program See It Now
- George Clooney as Fred W. Friendly, coproducer with Murrow of See It Now
- Robert Downey Jr., as Joseph Wershba, writer, editor, and correspondent for CBS News
- Patricia Clarkson as Shirley Wershba
- Frank Langella as William Paley, chief executive of CBS
- Jeff Daniels as Sig Mickelson, director of CBS News
- Tate Donovan as Jesse Zousmer
- Ray Wise as Don Hollenbeck, journalist for CBS News; accused in the press of being a "pinko".
- Helen Slayton-Hughes as Mary
- Alex Borstein as Natalie
- Thomas McCarthy as Palmer Williams
- Rose Abdoo as Mili Lerner
- Reed Diamond as John Aaron
- Matt Ross as Eddie Scott
- Grant Heslov as Don Hewitt, director of See It Now
- Glenn Morshower as Colonel Anderson
- Don Creech as Colonel Jenkins
- Robert John Burke as Charlie Mack
- Robert Knepper as Don Surine
- Dianne Reeves as Jazz Singer
- JD Cullum as Stage Manager
- Peter Jacobson as Jimmy
- Simon Helberg as CBS Page
- Joseph McCarthy (archive footage) as himself
- Liberace (archive footage) as himself
- Roy Cohn (archive footage) as himself
- Dwight D. Eisenhower (archive footage) as himself
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