Colin Sullivan: Do you know what will happen if you shoot me?
Billy Costigan: Yeah, this bullet will go right through your fucking head!

[to Frank Costello] You accuse me once, I put up with it. You accuse me twice... I quit. You pressure me to fear for my life and I will put a fucking bullet in your head as if you were anybody else. Okay?

Frank Costello: I'm going to have my associate search you.
Billy Costigan: No, no one's fucking searching me. Searching me for what?
Frank Costello: Contra-fucking-band. Take your shoes off.
[French slams Costigan into a chair]
Mr. French: Shoes.
Frank Costello: [to Costigan] I knew your father.
Billy Costigan: Yeah? You know he's dead?
Frank Costello: Oh, sorry. How'd he go?
Billy Costigan: He didn't complain.
Frank Costello: Yeah, that was his problem.
Billy Costigan: Who said he had a problem?
Frank Costello: I just said he had a fucking problem. There's a man who could have been anything.
Billy Costigan: Are you trying to say he was nothing?
[French slams Costigan onto a pool table and continues his search]
Frank Costello: I'm saying he worked at the airport.

Frank Costello: Have a seat, Bill.
[Costigan sits down at Costello's dinner table]
Frank Costello: [while eating crab] Do you know John Lennon?
Billy Costigan: Yeah, sure, he was the president before Lincoln.
Frank Costello: Lennon said, "I'm an artist. You give me a fucking tuba, I'll get you something out of it."
Billy Costigan: [sarcastically] Well I tell you Mr. Costello, I'd like to squeeze some fucking money out of it.
Frank Costello: Smart mouth. Too bad. If you'll indulge me...
[sees Gwen leaving]
Frank Costello: Now what?
Gwen: Choir practice.
Frank Costello: [annoyed] Choir practice.
[Costello pulls out a severed human hand]
Frank Costello: The point I'm making with John Lennon is - a man could look at anything, and make something out of it. For instance, I look at you and I think "what could I use you for?"

Billy Costigan: Listen, listen. I got like, like thirty thousand bucks, right? Insurance money. You know, after my mother passed and everything?
Cousin Sean: Yeah, yeah.
Billy Costigan: In your line of work, if I gave you like what, ten thousand, what could I get back?
Cousin Sean: You know... you know what you usually say at these moments?
Billy Costigan: What? What?
Cousin Sean: C'mon, man.
Billy Costigan: Aw, come on, you fucking moron. Come on. What, you want me to say it? Huh? I'm not a cop, alright? I'm your fucking cousin.
Cousin Sean: Yeah, you're bad! You corrupt fuck, man! You must be my cousin.

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Billy Costigan

Billy Costigan Picture

Billy Costigan is an undercover cop working for the Special Investigations Unit of Massachusetts's State Police. He's chosen to infiltrate Frank Costello's Organization. From there, The Departed takes off.

Played By
Leonardo DiCaprio
Full Name
Billy Costigan