| cast |
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| Series Regulars | |||
| |||
| Adam Ferrara | Adam Ferrara as Chief "Needles" Nelson | Andrea Roth | Andrea Roth as Janet Gavin |
| Callie Thorne | Callie Thorne as Sheila Keefe | Daniel Sunjata | Daniel Sunjata as Franco Rivera |
| Denis Leary | Denis Leary as Tommy Gavin | Jack McGee | Jack McGee as Chief Jerry Reilly |
| John Scurti | John Scurti as Lt. Kenny "Lou" Shea | Larenz Tate | Larenz Tate as Black Shawn |
| Michael Lombardi | Michael Lombardi as Mike Siletti | Sherri Saum | Sherri Saum as Natalie |
| Steve Pasquale | Steve Pasquale as Sean Garrity | | |
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| Recurring & Guests | |||
| |||
| Gina Gershon | Gina Gershon as Valerie | James Badge Dale | James Badge Dale as Timo Gavin |
| Lenny Clarke | Lenny Clarke as Uncle Teddy | Robert John Burke | Robert John Burke as Father Mickey Gavin |
| Tatum O'Neal | Tatum O'Neal as Maggie Gavin | Terry Serpico | Terry Serpico as Cousin Eddie |