David Haas Dastmalchian is an American film, television, and stage actor. He has had supporting roles in a number of superhero franchises: he portrayed Thomas Schiff in The Dark Knight (2008), Kurt and Veb in the Ant-Man franchise, Abra Kadabra in the CW's The Flash, and Polka-Dot Man in The Suicide Squad (2021). He has also appeared in three of Denis Villeneuve's films: Prisoners (2013), Blade Runner 2049 (2017), and Dune (2021). Dastmalchian wrote and starred in the 2014 semi-autobiographical film Animals. He had a supporting role in The Boogeyman and portrayed William Borden in Oppenheimer.

David Dastmalchian was born on July 21, 1975, in Allentown, Pennsylvania, to Priscilla and Hossein Dastmalchian. His father was an Iranian-American engineer who worked at engineering firm Black & Veatch. He has two sisters and a brother. His parents divorced, which he described as "tumultuous", and both remarried. He was raised in Overland Park, Kansas, where he attended Shawnee Mission South High School from which he graduated in 1994, having been part of the drama club. He described growing up in the Kansas City metropolitan area as "very traditional in one sense, and a conservative community that also had a rad, fringe, artistic, progressive tribe of people who were finding connectivity through the arts and the culture of KC and the surrounding suburbs."

In his childhood, Dastmalchian developed vitiligo, for which he suffered ridicule from his peers. Consequently, he experienced depression throughout his childhood. Growing up, he enjoyed football, theater, and comics. He would mow lawns, saving money to buy comics. He studied at The Theatre School at DePaul University and graduated in 1999.Prior to beginning his career as an actor, he dealt with a heroin addiction for five years. He wrote about his experiences in his screenplay, Animals, and continues to advocate for mental health and substance abuse treatment programs. Shortly after becoming sober, he worked at a seafood restaurant in Kansas City. He was also briefly a fisherman in Alaska.

Dastmalchian began his professional career in the mid-2000s in Chicago, working on stage and in commercials. He has received acclaim for lead roles in Tennessee Williams's The Glass Menagerie and Sam Shepard's Buried Child at Chicago's Shattered Globe Theatre. He was involved with a number of Chicago theater companies and was an artistic associate at Caffeine Theatre.

His feature film debut came in the late 2000s, as the Joker's deranged henchman, Thomas Schiff, in Christopher Nolan's The Dark Knight. His portrayal of Bob Taylor in Denis Villeneuve's Prisoners received strong reviews. Richard Corliss of Time called Dastmalchian's performance "excellent – chatty, modest with some subtle telltale psychopathy" and The Guardian's Paul MacInnes likened his introduction as a new suspect to Kevin Spacey's entrance in Seven.

In March 2014, Dastmalchian was awarded the Special Jury Prize for Courage in Storytelling at the South by Southwest Film Festival. He wrote and starred in the feature film Animals, directed by Collin Schiffli. Ashley Moreno of The Austin Chronicle credits Dastmalchian's screenplay with "present[ing] an authenticity often lacking in films about drug abuse." Film Threat's Brian Tallerico similarly sings the praises of Dastmalchian's breakout performance, noting his ability to "capture that sense of self-loathing that comes through in the body language of an addict without overselling it."

Other feature film appearances include starring roles in the psychological thriller The Employer, the indie grindhouse hit Sushi Girl, the drama Cass (winner, San Diego Black Film Festival), Girls Will Be Girls 2012 (a sequel to the 2003 cult hit Girls Will Be Girls), Saving Lincoln, Virgin Alexander, Ant-Man, and Michel Franco's Chronic.

He has also appeared on television: in an eleven-episode arc as Murdoc, the nemesis of the title character in MacGyver; as Simon on the Fox sci-fi series Almost Human, in the episode "Simon Says"; as a chess expert and murder suspect on the CBS forensics procedural drama series CSI: Crime Scene Investigation; and as Oz Turner on the BBC drama series Intruders. Other television appearances include the FX sitcom The League, the Showtime crime drama series Ray Donovan, and NBC's medical drama ER.

Dastmalchian portrayed DC Comics villain Abra Kadabra in seasons 3 and 7 of The Flash.

Dastmalchian later appears in the TV series Gotham portraying Dwight Pollard in the second season.

In 2017, he reunited with Villeneuve when he appeared in Blade Runner 2049. The following year he reprised the role of Kurt in the Ant-Man sequel Ant-Man and the Wasp. In 2021, he appeared as Polka-Dot Man in The Suicide Squad, a character with whom he said he connected on a personal level due to the childhood bullying he suffered as a result of his vitiligo. Later that same year, he appeared in his third collaboration with Villeneuve when he portrayed Piter De Vries in Dune.In 2023, Dastmalchian starred in the horror films Late Night with the Devil and The Boogeyman, as well as The Last Voyage of the Demeter. Also in 2023, he had a minor role as William L. Borden in Christopher Nolan's biopic epic Oppenheimer.

Dastmalchian is a comic book writer. He debuted his horror comic series Count Crowley in 2019 published by Dark Horse Comics.

Dastmalchian married artist Evelyn "Eve" Leigh in 2014. They live in Los Angeles with their two children.