The ninth season of Blue Bloods, a police procedural drama series created by Robin Green and Mitchell Burgess, premiered on CBS September 28, 2018. The season concluded on May 10, 2019 and contained 22 episodes. Cast Donnie Wahlberg (Danny Reagan), Bridget Moynahan (Erin Reagan), Will Estes (Jamie Reagan), and Len Cariou (Henry Reagan) are first credited. Sami Gayle (Nicky Reagan-Boyle) is credited next, marking the fifth season she has been included in the opening credits. Tom Selleck (Frank Reagan) receives an "and" billing at the close of the main title sequence. Marisa Ramirez, as Danny's partner Detective Maria Baez, and Vanessa Ray, as Jamie's partner Eddie Janko, continue to receive "also starring" billing for season 9. Gregory Jbara as Deputy Commissioner of Public Information Garrett Moore, Robert Clohessy as Lt. Sidney Gormley, and Abigail Hawk as Detective Abigail Baker, Frank's primary aide, appear regularly and receive "special guest star" billing. Main cast Tom Selleck as NYPD Police Commissioner Francis "Frank" Reagan Donnie Wahlberg as Detective 1st Grade Daniel "Danny" Reagan Bridget Moynahan as ADA Erin Reagan Will Estes as Officer/ Sergeant Jamison "Jamie" Reagan Len Cariou as Henry Reagan Sami Gayle as Nicole "Nicky" Reagan-Boyle Marisa Ramirez as Detective 1st Grade Maria Baez Vanessa Ray as Officer Edit "Eddie" Janko Recurring cast Abigail Hawk as Detective 1st Grade Abigail Baker Gregory Jbara as Deputy Commissioner of Public Information Garrett Moore Robert Clohessy as Lieutenant Sidney "Sid" Gormley Stacey Keach as Archbishop Kevin Kearns Steve Schirripa as DA Investigator Anthony Abetemarco Lauren Patten as Officer Rachel Witten Peter Hermann as Jack Boyle Bebe Neuwirth as Kelly Peterson Callie Thorne as Maggie Gibson Tony Terraciano as Jack Reagan Andrew Terraciano as Sean Regan Treat Williams as Lenny Ross Episodes Ratings References External links 2018 American television seasons 2019 American television seasons Blue Bloods (TV series)