The Northwest Marine Terminal Association (NWMTA) is a voluntary association of deepwater ports and marine terminal operators in Oregon and Washington.

Current NWMTA members include the ports of Anacortes, Astoria, Bellingham, Coos Bay, Everett, Grays Harbor, Kalama, Longview, Northwest Seaport Alliance, Olympia, Pasco, Port Angeles, Portland, Seattle, St Helens, and Vancouver, USA.

Since 1939, the Northwest Marine Terminal Association has collaborated on trade issues and economic development.

NWMTA members exchange information to facilitate long range industry planning on issues that affect terminal and other maritime activities.