Chicago Fire season 12

The twelfth season of Chicago Fire, an American drama television series with executive producer Dick Wolf, and producers Derek Haas and Matt Olmstead, was ordered on April 10, 2023, by NBC. The season premiered on January 17, 2024. The season concluded on May 22, 2024 and contained 13 episodes. The season was affected by strikes undertaken by the Writers Guild of America (which began on May 2 and ended on September 27) and SAG-AFTRA (which began on July 14 and ended on November 9).

Main

 * Taylor Kinney as Lieutenant Kelly Severide, Squad Company 3
 * Kara Killmer as Paramedic in Charge Sylvie Brett, Ambulance 61 (Episodes 1–6)
 * David Eigenberg as Lieutenant Christopher Herrmann, Engine Company 51
 * Joe Minoso as Firefighter Joe Cruz, Squad Company 3
 * Christian Stolte as Firefighter Randall "Mouch" McHolland, Truck Company 81
 * Miranda Rae Mayo as Lieutenant Stella Kidd, Truck Company 81
 * Alberto Rosende as Firefighter Blake Gallo, Truck Company 81 (Episode 1)
 * Daniel Kyri as Firefighter Darren Ritter, Engine Company 51
 * Hanako Greensmith as Paramedic in charge Violet Mikami, Ambulance 61
 * Eamonn Walker as Deputy District Chief Wallace Boden, District 4

Recurring

 * Randy Flagler as Firefighter Harold Capp, Squad Company 3
 * Anthony Ferraris as Firefighter Tony Ferraris, Squad Company 3
 * Jake Lockett as Firefighter Sam Carver, Truck Company 81
 * Rome Flynn as Firefighter Derrick Gibson
 * Robyn Coffin as Cindy Herrmann, Christopher's wife
 * Kristen Gutoskie as Chloe Cruz, Joe Cruz's wife
 * Carlos S. Sanchez as Javier Cruz, Joe’s adopted son
 * Katelynn Shennett as Firefighter Kylie Estevez
 * Laura Allen as Paramedic Chief Robinson
 * Jocelyn Hudon as Paramedic Lizzy Novak
 * Michael Bradway as Firefighter Jack Damon

Special guest stars

 * Jesse Spencer as Captain Matthew Casey

Crossover characters

 * Amy Morton as Desk Sergeant Trudy Platt
 * Dominic Rains as Dr. Crockett Marcel

Casting
On October 31, 2023, NBC announced that Taylor Kinney would return to the series following his leave of absence. On December 13, 2023, NBC announced that Rome Flynn would join the series in a recurring role as 51's latest recruit with a dark past. On March 29, 2024, NBC announced that Jocelyn Hudon would join the series as the newest paramedic replacing Kara Killmer in a recurring role with the potential to be upgraded to a series regular. On April 3, 2024, it was announced that newcomer Michael Bradway would replace Rome Flynn, who exited the series after six episodes as 51’s newest firefighter Jack Damon. His role also has the potential to be a series regular in the upcoming thirteenth season. His first appearance was on the tenth episode of the season.

Kara Killmer, Alberto Rosende and Eamonn Walker's Exits
On November 16, 2023, it was announced that longtime cast member Kara Killmer who portrays Paramedic in charge, Sylvie Brett, would exit midway through the twelfth season. Her final episode aired on February 28, 2024. On November 30, 2023, it was also announced that Alberto Rosende who has portrayed Firefighter Blake Gallo since the eighth season was also set the exit the series as well. His final appearance was on the season premiere. It has been reported that both exits were creative decisions. On May 7, 2024, it was announced that original cast member Eamonn Walker who has portrayed Wallace Boden would exit the series at the end of the twelfth season. It was later stated that Walker will return to the series in a recurring role.