Jake Gyllenhaal as Swoff; Scott MacDonald as D.I. Fitch; Lo Ming as Bored Gunny (as Ming Lo); Kevin Foster as Branded Marine; Peter Sarsgaard as Troy; Damion Poitier as Poitier; Riad Galayini as Nurse; Craig Coyne as Young Mr. Swofford; Katherine Randolph as Young Mrs. Swofford; Rini Bell as Swoff's Sister

Arnold Schwarzenegger as Howard 'Howie' Langston; Sinbad as Myron Larabee; Phil Hartman as Ted Maltin; Rita Wilson as Liz Langston; Robert Conrad as Officer Hummell; Martin Mull as D.J.; Jake Lloyd as Jamie Langston; James Belushi as Mall Santa; E.J. De La Pena as Johnny (as E.J. de la Pena); Laraine Newman as First Lady

Arnold Schwarzenegger as Dr. Alex Hesse; Danny DeVito as Dr. Larry Arbogast; Emma Thompson as Dr. Diana Reddin; Frank Langella as Noah Banes; Pamela Reed as Angela; Aida Turturro as Louise; James Eckhouse as Ned Sneller; Megan Cavanagh as Willow; Welker White as Jenny; Kathleen Chalfant as Casitas Madres Receptionist

Sam Neill as Dr. Alan Grant; Laura Dern as Dr. Ellie Sattler; Jeff Goldblum as Dr. Ian Malcolm; Richard Attenborough as John Hammond; Bob Peck as Robert Muldoon; Martin Ferrero as Donald Gennaro; Joseph Mazzello as Tim Murphy; Ariana Richards as Lex Murphy; Samuel L. Jackson as Ray Arnold; B.D. Wong as Henry Wu