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Recurring Characters

Recurring Characters

(In order of number of episodes)

  • Sidney Perlmutter (Arye Gross) - The curmudgeonly Medical Examiner who doesn't like Castle very much. Appears in 12 episodes.
  • Jim Beckett (Scott Paulin) - Kate Beckett's lawyer father. Appears in 8 episodes.
  • Tory Ellis (Maya Stojan) - An attractive CSU Tech. Appears in 6 episodes.
  • Pi (Myko Olivier) - Alexis' fruitarian boyfriend. Appears in 6 episodes.
  • Dr. Carter Burke (Michael Dorn) - The NYPD psychiatrist Beckett sees to treat her post-traumatic stress disorder. Appears in 5 episodes)
  • Jenny Ryan (Juliana Dever) - Ryan's girlfriend/fiancee/wife. Appears in 5 episodes.
  • Josh Davidson (Victor Webster) - The heart surgeon Beckett dates briefly. Appears in 4 episodes.
  • Tom Demming (Michael Trucco) - A robbery detective Beckett dates at the end of season 4. Appears in 4 episodes.
  • Gina Cowell (Monet Mazur) - Castle's second wife, his girlfriend briefly, and his publisher. Appears in 3 episodes.
  • Ann Hastings (Valerie Azlynn) - NYPD beat cop who Beckett & Castle discover moonlights as a crime-fighting vigilante. Appears in 3 episodes.
  • Ashley (Ken Baumann) - Alexis' first serious boyfriend. Appears in 3 episodes.
  • Triple Killer/3XK (Michael Mosley) - A sadistic serial killer who repeatedly eludes capture. Appears in 3 episodes.
  • Rachel McCord (Lisa Edelstein) - Beckett's partner when she worked in Washington, DC. Appears in 3 episodes.
  • Meredith (Darby Stanchfield) - Castle's first wife and Alexis' mother. Appears in 2 episodes.
  • Will Sorenson (Bailey Chase) - An FBI Agent who Beckett dated for 6 months. Appears in 2 episodes.
  • Jordan Shaw (Dana Delany) - An FBI Agent and profiler who Castle admires. Appears in 2 episodes.
  • William Bracken (Jack Coleman) - The U.S. Senator who ordered Beckett's mother's murder. Appears in 2 episodes.
  • Roselyn Karpowski (Diana Maria Riva) - One of Beckett's detective colleagues. Appears in 2 episodes.
  • Judge Markway (Dan Castellaneta) - A judge with whom Castle occasionally plays golf. Appears in 2 episodes.
  • Mike Royce (Jason Beghe) - Beckett's training officer from when she started with the NYPD. Appears in 2 episodes.
  • Mayor Robert Weldon (Joseph C. Phillips/Derek Webster) - Mayor of New York City, from whom Castle has permission to shadow Beckett. Joseph Phillips plays him in 2 episodes, and Derek Webster in 1.
  • Dr. Clark Murray (Robert Picardo) - Known as "Dr. Death", Castle and Lanie enlist his help with cases that relate to Beckett's mother's murder. Appears in 2 episodes.
  • Grant "Sully" Sullivan (Joshua Bitton) - The sloppy homicide detective who takes Beckett's desk when she leaves to work in DC. Appears in 2 episodes.
  • Gilbert Mazzarra (Danny Nucci) - A detective friend of Esposito's. Appears in 2 episodes.
  • Dr. Holloway (Phil LaMarr) - An NYPD psychologist. Appears in2 episodes.
  • West Side Wally (Loren McCraley) - A homeless man who helps Beckett and her team with cases. Appears in 2 episodes.
  • Beau Randolph (Jordan Belfi) - The sleazy producer of a series of college girl videos. Appears in 2 episodes.
  • Chet - Martha's unseen boyfriend and fiancee.

Real-life writers Stephen J. Cannell, James Patterson, and Michael Connelly all appear as themselves and friends of Castle's. Over periodic games of poker at Castle's apartment, they help Castle figure out murder cases that have he and Beckett stumped. Cannell appears in the series premiere and the first and final episodes of season 2, Patterson in the series premiere and final episode of season 2, and Connelly in the first and final episodes of season 2.