Calvin, portrayed by Ice Cube, proudly represents his hometown of Chicago, where he has dedicated himself to running a barbershop that not only serves his community but also supports his family. Unfortunately, the city is struggling, increasingly marred by gang violence and escalating criminal activities, which have hit close to home for Calvin. In a comical scene, Eddie, played by Cedric the Entertainer, bursts into the barbershop in a panic after a run-in with some gang members regarding their sagging pants. This leads to a false alarm when the door banging turns out to be just the breakfast delivery.
The barbershop, now co-managed by Calvin and Angie, played by Regina Hall, caters to both men and women, with new recruits like Bree (Margot Bingham) and Draya, portrayed by Nicki Minaj. The male crew includes Jerrod (Lamorne Morris), Raja (Utkarsh Ambudkar), and Rashad, played by Common, who is the new husband of Terri, played by Eve. Young Anthony Clark (Torion Sellers) also helps out while focusing on his education. One day, Calvin catches Kenny (Diallo Thompson), Rashad's son, attempting to steal candy, indicating the kind of trouble brewing in their neighborhood.
The tensions rise as rival gangs, the Crips and Bloods, clash outside the barbershop—only to be interrupted by the unexpected appearance of the Bloods leader, Yummy (Tyga), who is friendly towards the boys, mistakenly believing they want to join his gang. Conversations in the shop touch on modern relationships, with Bree criticizing the perception of women, while racial tensions are brought to the forefront, with Raja asserting that the presence of a black president signifies progress, countered by Rashad, who insists that real issues remain unaddressed.
Calvin is also contemplating a risky business move to relocate the barbershop to a safer, more affluent part of town, a secret shared only with his wife, Jennifer (Jazsmin Lewis). The situation escalates when a potential altercation occurs as two clients, Jay (Renell Gibbs) and Marquis (Jamal Woolard), come into conflict, only to be diffused by Calvin and Rashad's intervention.
After the boys get into trouble at school due to gang activities, Calvin considers switching Jalen (Michael Rainey, Jr.) to a Catholic school, furthering his concern about Kenny's friendship with his son. Meanwhile, news of a community forum organized by the barbershop crew spreads, seeking to establish a ceasefire amidst the turmoil, complete with free haircuts for attendees.
As the ceasefire event approaches, romantic tensions rise. Rashad mistakenly believes Draya is being flirtatious when she invites him upstairs, creating complications in his relationship with Terri. The peace effort is underscored by the arrival of Officer Terrence (Timon Kyle Durett), who brings tragic news of Anthony’s death, leading Calvin to question the initiative's purpose. However, inspired by Eddie's encouragement, Calvin returns to support the ceasefire, which garners attention and a significant turnout thanks to social media outreach.
Tragedy strikes again when Calvin finds that Jalen is in danger of gang initiation. Rushing to the scene, he sees Jalen opting to stay with him rather than join a gang, underscoring their father-son bond. The film culminates in a heartfelt celebration at the shop, where Calvin expresses his unwavering love for Chicago, as he and his community try to retain hope amidst adversity. In a light-hearted twist during the credits, the barbershop receives a visit from President Obama (Reggie Brown), leading to an amusing mishap with Eddie’s haircutting skills.
