The Architect of the Capitol is both the name of the U.S. legislative branch agency responsible for the maintenance of the Capitol campus and the title for the leader of the agency.

Office of the Architect

The OA provides an enterprise perspective and vision for the AOC and helps the agency navigate legal, political and regulatory requirements and challenges.

Office of the Chief Administrative Officer

The OCAO provides administrative and business support for the Architect of the Capitol.

Office of the Chief Engineer

The OCE oversees long-range facility planning, architectural and engineering design, historic preservation and project, program and construction management.

Office of the Chief Financial Officer

The OCFO manages the financial needs of the operational jurisdictions and central services.

Office of the Chief of Operations

The OCO oversees the operational jurisdictions that help fulfill the Architect of the Capitol's mission.

Office of the Chief Security Officer

The OSCO is responsible for the maintenance, care and operation of the buildings, grounds and security enhancements of the U.S. Capitol Police and more.

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History & Discoveries

Notable Oaks of the U.S. Capitol Grounds

This month we celebrate our national tree: the oak. Oaks often live for hundreds of years and are considered a keystone species with entire ecosystems depending on them for survival and habitat.

Group of kids listening to a presenter.
Public Notice

What's Happening at the Capitol In October

Upcoming tours and student programs provided by the U.S. Capitol Visitor Center. Highlights include in person, online and homeschool opportunities designed by the Capitol Visitor Center's Education team.

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