The D.C. trip marks the first time Zuckerberg has returned to Capitol Hill since his highly-publicized testimony about the Cambridge Analytica scandal last year.
"Mark will be in Washington, D.C., to meet with policymakers and talk about future internet regulation," Facebook spokesman Andy Stone told The Hill. "There are no public events planned."
The Facebook CEO will huddle with members that have spent the past year slamming his company over how it has handled and amassed user data, dealt with extremism and misinformation on its platform, and potentially used its dominant market position to squash competitors.
Late Wednesday night, Sen. Mark Warner's office said that the Virginia Democrat had arranged a dinner for Zuckerberg and a group of lawmakers. A spokesperson confirmed Sen. Richard Blumenthal (D-Conn.) attended the dinner.