- Michael Douglas as Dan Gallagher, husband of Beth, father of Ellen, and a New York City lawyer who has an affair with Alex Forrest and later regrets it.
- Glenn Close as Alex Forrest, who becomes obsessed with Dan after a very brief affair.
- Anne Archer as Beth Rogerson Gallagher
- Ellen Hamilton Latzen as Ellen Gallagher
- Stuart Pankin as Jimmy
- Ellen Foley as Hildy
- Fred Gwynne as Arthur, Dan's boss
- Meg Mundy as Joan Rogerson, Beth's mother
- Tom Brennan as Howard Rogerson, Beth's father
- Lois Smith as Martha, Dan's secretary
- Mike Nussbaum as Bob Drimmer
- J. J. Johnston as O'Rourke
- Michael Arkin as Lieutenant
- Jane Krakowski as Christine, the babysitter
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