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Don Flack is a character on the CBS television series, CSI: NY. He is portrayed by Eddie Cahill.

Detective Don Flack (badge #8571) is portrayed as the legal muscle for the CSI: NY team, similar to the roles of his Las Vegas and Miami counterparts Jim Brass and Frank Tripp. He can often be seen interrogating suspects with a characteristic wit and sarcasm. Though not as highly educated as the CSIs (in episode 211, "Trapped", Flack quips "and for those of us with just a high school diploma" when Stella is talking about the chemical composition of soap and bleach), Flack is intellectual and trusts the CSIs' judgment and respects their findings. Throughout the series, he defends them to skeptical colleagues, especially in episode 311, "Raising Shane".

Flack is a homicide detective with the NYPD, known for both his dry wit and his determination to hunt down suspects (even to the point of chasing them down alleys and over rooftops). He was mentored by another cop, Gavin Moran, whom he is later forced to arrest after it comes to light that Moran concealed evidence during the course of an investigation (episode 117, "The Fall"). He is at least a second-generation cop; Moran mentioned having worked with Don, Sr. as well. He is both a colleague and a friend to the members of the New York City Crime Lab. After Stella Bonasera is attacked in her apartment by her unstable boyfriend, Flack gently helps her through the aftermath when he comes to the hospital to take her statement (episode 221, "All Access").

His friendship with Mac Taylor is tested when Taylor uncovers evidence that one of Flack's men, Truby, is a dirty cop and asks Don to turn over his memo notebook to prove it. Though Flack eventually capitulates, their relationship is a bit tense for a some time afterward (episode 308, "Consequences"; episode 310, "Sweet 16"). Flack defends Taylor to Captain Gerrard, who is investigating Sheldon Hawkes, the prime suspect in a robbery-homicide, after Taylor locks himself in the interrogation room with Sheldon. Flack affirms that Gerrard would do the same for him (Flack) (episode 311, "Raising Shane").

Don Flack has not been a contender in any CBUB matches.