Other
- Willamette Industries, Inc., a former Fortune 500 company purchased by Weyerhauser
- Willamette locomotive, a type of steam locomotive formerly used in the logging and mining industries
- Willamette, the codename for the first core used in the Intel Pentium 4 microprocessor
- Willamette, Colorado, the fictional setting in the Xbox 360 and Wii game Dead Rising
- USS Willamette, a US Navy fleet replenishment oiler
- Willamette Hops, used in the brewing of beer, see List of hop varieties
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