Season Three of Blue Bloods premiered on September 28, 2012 on CBS.
- Tom Selleck as Francis "Frank" Reagan, Police Commissioner and widowed father.
- Donnie Wahlberg as Daniel "Danny" Reagan, Detective.
- Bridget Moynahan as Erin Reagan-Boyle, Assistant District Attorney and single mother.
- Will Estes as Jamison "Jamie" Reagan, rookie police officer and recent Harvard Law graduate.
- Len Cariou as Henry Reagan, retired Police Commissioner, father of Frank and grandfather of Danny, Erin and Jamie.
- Jennifer Esposito as Detective Jackie Curatola (episode 4-present), Danny's partner.
- Amy Carlson as Linda Reagan, wife of Danny.
- Sami Gayle as Nicole "Nicky" Reagan-Boyle, Erin's daughter.
|01||Family Business||September 28, 2012|
|A dangerous criminal (guest star Michael Madsen) from Danny Reagan’s (Donnie Wahlberg) past comes back to seek revenge. Meanwhile, Jamie meets his new partner, Vinny Cruz (Sebastian Sozzi).|
|02||Domestic Disturbance||October 5, 2012|
|When an injured woman decants her claim of domestic violence, Danny and Jackie find out that she is involved in a secret relationship.|
|03||Old Wounds||October 12, 2012|
|Danny believes a serial killer is on the loose when two separate murder victims are identified as members of a group charged with a gang rape.|
|04||Scorched Earth||October 19, 2012|
|Danny and Jackie set out to investigate the murder of a bride on her wedding day in a drive-by gang shooting, but are diverted to a different case.|
|05||Risk and Reward||October 26, 2012|
|Shortly after Frank awards a detective with a medal for his undercover work in Malaysia, the detective is taken hostage by a Malaysian drug lord.|
|06||Greener Grass||November 9, 2012|
|When Erin's key witness, an infamous photographer, is nearly killed in a hit and run, she arranges for Danny to safeguard him.|
|07||Nightmares||November 9, 2012|
|When a knife-wielding attacker dressed as Baron Samedi, the Spirit of Death, stabs a man in costume on Halloween, Danny enters the world of voodoo alongside an unexpected interim partner, Kate Lansing from the IAB (Megan Ketch).|
|08||Higher Education||November 30, 2012|
|Danny arrives at a college campus to find a murdered student, who was thought to be dealing drugs.|
|09||Secrets and Lies||December 7, 2012|
|When Danny and Kate come up empty-handed on leads for a shooting, Linda overhears the victim telling his priest who is responsible.|
|10||Fathers and Sons||January 4, 2013|
|When two motorists driving gas-guzzling cars die at the hands of a sniper, the city believes it's the work of a radical environmental serial killer.|
|11||Front Page News||January 11, 2013|
|Jamie must deal with the emotional consequences of his actions on the job when he has a confrontation with a suicidal man.|
|12||Framed||January 18, 2013|
|Danny's car matches an NYPD description of a vehicle involved in a drug deal, and he is taken into custody when cocaine is found in the trunk. At the episode's conclusion, Kate tells Danny that she's returning to IAB.|
|13||Inside Jobs||February 1, 2013|
|When a man with multiple rat bites is thrown from a moving car, Danny works the case to find out who was trying to send a message and why, with new partner Candice "Mac" McElroy (Megan Boone), an Airborne war veteran.|
|14||Men in Black||February 8, 2013|
|Before a Hasidic grand rebbe passes away, he chooses his youngest son to succeed him. But when the new appointee dies suddenly, Danny investigates.|
|15||Warriors||February 15, 2013|
|When a 10-year old boy is the victim of an incident in the projects, Danny's heated approach to the cases lands him in anger management class.|
|16||Quid Pro Quo||February 22, 2013|
|Erin and Danny investigate a cold case involving a girl who was attacked by her rich and powerful boyfriend, who was never convicted.|
|17||Protest Too Much||March 8, 2013|
|When an off-duty cop tries to stop a bank robbery, he is disarmed by the "Bonnie and Clyde" robbers who take his gun and wound an innocent bystander. Danny looks into this situation with Detective Maria Baez, who will become his new long-standing partner.|
|18||No Regrets||March 15, 2013|
|When the same tragedy occurs to people who don't appear to be connected, Danny must find out what they have in common and who is responsible.|
|19||Loss of Faith||April 5, 2013|
|When a religious young women is murdered, Danny questions her family members, who are shocked to learn that she had a secret relationship.|
|20||Ends and Means||April 12, 2013|
|When two Wall Street brokers are killed in drug deals, Danny looks to question a wounded accomplice at the hospital, but he is stopped by Linda.|
|21||Devil's Breath||April 26, 2013|
|When Danny finds a disoriented man covered in blood in a park, he finds it hard to believe that the man has no recollection of the night's events.|
|22||The Bitter End||May 3, 2013|
|When a young woman commits suicide, Danny is emotional because he promised to help the woman when her parents were taken from her.|
|23||This Way Out||May 10, 2013|
|As the Reagans rally to take down a gang leader responsible for the murder of someone close to them, Danny looks to the leader's girlfriend for help.|