Prosectors
Manhattan District Attorneys
Roy Thinnes as Manhattan District Attorney Alfred Wenthworth (pilot only)
Steven Hill as Manhattan District Attorney Adam Schiff (1990-2000; Seasons 1-10)
Dianne Wiest as Interim Manhattan District Attorney Nora Lewin (2000-02; Seasons 11-12)
Fred Dalton Thompson as Manhattan District Attorney Arthur Branch (2002-2007; Seasons 13-17)
Sam Waterston as Manhattan District Attorney John James 'Jack' McCoy (1994-2008; Seasons 5-17)
Executive Assistant District Attorney
Michael Moriarty as Executive Assistant District Attorney Benjamin 'Ben' Stone (1990-94; Seasons 1-4)
Sam Waterston as Executive Assistant District Attorney John James 'Jack' McCoy (1994-2008; Seasons 5-17)
Linus Roache as Executive Assistant District Attorney Michael Cutter (2008- ; Season 18-)
Assistant District Attorneys
Richard Brooks as Assistant District Attorney Paul Robinette (1990-93; Seasons 1-3)
Jill Hennessy as Assistant District Attorney Claire Kincaid (1993-1996; Seasons 4-6)
Carey Lowell as Assistant District Attorney Jamie Ross (1996-1998; Seasons 7-8)
Angie Harmon as Assistant District Attorney Abbie Carmichael (1998-2001; Seasons 9-11)
Elisabeth Rohm as Assistant District Attorney Serena Southerlyn (2001-2005; Seasons 12-15)
Annie Parisse as Assistant District Attorney Alexandria Borgia (2005-2006; Seasons 15-16)
Alana de la Garza as Assistant District Attorney Consuela 'Connie' Rubirosa (2006-; Season 17-)
Other
Steven Zirnkilton as Narrator (1990-Present)