The Onion Portage Archeological District encompasses a major archaeological site in Kobuk Valley National Park in northwestern Alaska.

[3] The Onion Portage site is located on the northern banks of the Kobuk River.

[6] The Onion Portage site was first identified by the pioneering Arctic archaeologist J. Louis Giddings in 1940, during his first visit to the Kobuk River.

After World War II Giddings focused his efforts on other areas (notably the Iyatayet site and sites at Cape Krusenstern, both also National Historic Landmarks, where he began to assemble a chronology of Arctic cultures.

Giddings led a major excavation at the site in 1964, the last year of his life, seeking evidence of older cultures in the many layers of deposits.