Maria Cantwell serves on the following Senate committees:
- Senate Committee on Commerce, Science and Transportation
- Chairman, Subcommittee on Aviation Operations, Safety and Security
- Member, Subcommittee on Competitiveness, Innovation and Export Promotion
- Member, Subcommittee on Communications, Technology and the Internet
- Member, Subcommittee on Surface Transportation and Merchant Marine Infrastructure, Safety and Security
- Member, Subcommittee on Science and Space
- Member, Subcommittee on Oceans, Atmosphere, Fisheries, and Coast Guard
- Senate Committee on Energy and Natural Resources
- Chairman, Subcommittee on Energy
- Member, Subcommittee on Water and Power
- Member, Subcommittee on Public Lands and Forests
- Senate Committee on Finance
- Member, Subcommittee on Energy, Natural Resources and Infrastructure
- Member, Subcommittee on Taxation and IRS Oversight
- Member, Subcommittee on Health Care