Lake Siegel Bell (born March 24, 1979) is an American actress, director, and screenwriter. She voices the character Poison Ivy in Harley Quinn.

She has also voiced multiple minor characters such as James Gordon's wife Barbara, former police officer Cheryl, multiple students in the episode "Riddle U" and a singing fish in the episode "Bachelorette".

Before Harley Quinn she has starred in a lot of various television series, including Boston Legal (2004–2006), Surface (2005–2006), How to Make It in America (2010–2011) and Childrens Hospital (2008–2016), and in films including Over Her Dead Body (2008), What Happens in Vegas (2008), It's Complicated (2009), No Strings Attached (2011), Million Dollar Arm (2014), No Escape (2015), The Secret Life of Pets (2016), and Home Again (2017).

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