Heidi Hynden Walch (born February 1, 1971) is an American voice actress and actress.
She is best known for voicing Princess Bubblegum in Adventure Time, Starfire in Teen Titans, Penny Sanchez on the Nickelodeon show ChalkZone, Elsie on the Disney Channel show Stanley, Ace in Justice League and Justice League Unlimited, Harley Quinn in The Batman, and in anime, she has voiced Amy Stapleton in IGPX, Emiri Kimidori in The Melancholy of Haruhi Suzumiya, Yutaka Kobayakawa in Lucky Star and Nia Teppelin in Tengen Toppa Gurren Lagann. in 1989 Walch received the Presidential Scholarship and went to the UNC School of the Arts in Winston-Salem, North Carolina. After UNC, she went to Chicago, Illinois, where she did plays.
In video games, she voiced Jasmine and Junko in Viewtiful Joe: Double Trouble!, Coco Bandicoot and Polar in Crash Team Racing. She recently provided the English voice of Hitomi in Dead or Alive Xtreme 2 and Dead or Alive Paradise. Most recently, she voiced Viridi, the Goddess of Nature, in Kid Icarus: Uprising.
In live-action, she played Mae Capone on The Untouchables. She also is represented commercially by Atlas Talent Agency.