Dignam: I'm the guy doing my job, you must be the other one!
[after he is told that the FBI are able to monitor Costello's calls]
Ellerby: [Celebrating] Patriot Act! Patriot Act! I love the Patriot Act!
Dignam: What's a lace curtain motherfuker like you doing in the Staties?
Ellerby: I'm gonna go have a smoke right now. You want a smoke? You don't smoke, do ya, right? What are ya, one of those fitness freaks, huh? Go fuck yourself.
Colin Sullivan: [Fighting] What the fuck?
Dignam: You motherfucker! Cocksucker!
Colin Sullivan: [Fighting back] What the fuck did you say you cocksucker? What the fuck did you fucking say?
Dignam: Your mother's cunt! Your mother's cunt!
Frank Costello: You get your period yet?
Dignam: Maybe, maybe not. Maybe fuck yourself.
Frank Costello: She fell funny!
Frank Costello: No tickey, no laundry!
Frank Costello: In this archdiocese, God don't run the bingo.
Ellerby: Want a smoke? What you don't smoke? What are you some kind of fitness freak? Fuck you.
Dignam: I'm the guy who does his job. You must be the other guy.
Mr. French: There's guys you can hit and guys you can't hit. Now he's not a guy you can't hit, but he's pretty close to a guy you can't hit.
Ellerby: [on Sullivan getting married] Marriage is an important part of getting ahead. It lets people know you're not a homo. A married guy seems more stable. People see the ring, they think "at least somebody can stand the son of a bitch." Ladies see the ring, they know immediately that you must have some cash, and your cock must work.
Colin Sullivan: [laughs nervously] Yeah, it's workin'. Overtime!
Frank Costello: What the fuck is it with and your phone? Uh?
Colin Sullivan: You know.
Dignam: I can't wait to wipe that fucking smirk right off of your face.
Billy Costigan: Don't you fucking threaten me!
Dignam: You may play a tough guy for your gangster friends, but you don't get nothing past me, you lace-curtain Irish fucking pussy!
Billy Costigan: [Punches Dignam] You motherfucker!
Frank Costello: I got fucking rats in my crew.
Billy Costigan: You think it's me? I'm not a fucking rat.
Ellerby: Yes, those. I don't know what they are, you don't know what they are, who gives a fuck.