In television, Hahn was featured in a recurring guest role on the NBC sitcom "Parks and Recreation" (2012-2015), for which she received a Critics' Choice nomination for Best Guest Performer in a Comedy Series, she starred in the Prime Video comedy-drama series "Transparent" (2014–2019), for which she received a nomination for a Primetime Emmy Award for Outstanding Supporting Actress in a Comedy Series. Hahn also starred in the Prime Video comedy series "I Love Dick" (2016–2017), the HBO comedy miniseries "Mrs. Fletcher" (2019), and the HBO drama miniseries "I Know This Much Is True" (2020). Since 2020, Hahn has voiced Paige Hunter in the Apple TV+ animated musical comedy series "Central Park" and starred as Agatha Harkness in the Disney+ television series "WandaVision" (2021), for which she received critical acclaim.