Ohad "Ady" Barkan (Hebrew: עדי ברקן; December 18, 1983 – November 1, 2023) was an American lawyer and liberal activist. He was a co-founder of the Be a Hero PAC and was an organizer for the Center for Popular Democracy, where he led the Fed Up campaign. Barkan confronted Senator Jeff Flake on a plane in 2017, asking him to "be a hero" and vote no on a tax bill that threatened cuts to Medicare, Medicaid, and Social Security.

Barkan, who was diagnosed with the terminal neurodegenerative disease ALS (also known as Lou Gehrig's disease) in 2016 shortly after the birth of his son, was called "the most powerful activist in America" in a headline from 2019 in Politico Magazine. In 2020, he was included on Time's list of the 100 most influential people in the world.