text: Scott Atkinson appears as a police officer in four episodes, one per season in Seasons 1 - 4
  B
  Charlie Babcock - Stu Durber (6 episodes, seasons 2 and 5)
  Scott Bakula - Trip Weston (5 episodes, season 8)
  Cecilia Balagot - Grace Sanchez (4 episodes, season 7)
  Daniella Baltodano - Celia Solis (50 episodes, seasons 4-8)
  John Barrowman - Patrick Logan (6 episodes, season 6)
  Justine Bateman - Ellie Leonard (5 episodes, season 4 and 8)
  Orson Bean - Roy Bender (23 episodes, seasons 6-8)
  Polly Bergen - Stella Wingfield (10 episodes, seasons 3-5, and 7)
  Emily Bergl - Beth Young (14 episodes, seasons 7-8)
  Julie Benz - Robin Gallagher  (6 episodes, season 6)
  Daniela Bobadilla - Marisa Sanchez (2 episodes, season 8)
  John Bobek - Tucker (2 episodes, season 3)
  Michael Bofshever - Kenny Stevens (2 episodes, season 3)
  Lesley Boone - Lucy Blackburn (2 episodes, season 5)
  Terry Bozeman - Dr. Lee Craig (6 episodes, seasons 1-3)
  Jill Brennan - Tish Atherton (5 episodes, seasons 1-3)
  Pat Crawford Brown - Ida Greenberg (24 episodes, seasons 1-4)
  C
  Marie Caldare - Lila Dash (4 episodes, season 5)
  Scott Allan Campbell - Detective Sloan (2 episodes, season 2)
  Ridge Canipe - Danny Farrell (2 episodes, seasons 2 and 3)
  Ryan Carnes - Justin (11 episodes, seasons 1−2)