Mosier Mounds Complex

{{Use mdy dates|date=August 2023}}

{{Infobox NRHP

| name = Mosier Mounds Complex

| nrhp_type =

| image = Mosier Mounds 1 - Mosier Oregon.jpg

| caption = The Mosier Mounds in 2009

| alt = Photograph of rock scree in piles

| location = {{Address restricted|spell_archaeology=1}}

| nearest_city = Mosier, Oregon

| area =

| built =

| restored =

| restored_by =

| added = February 24, 2003

| refnum = 03000053

}}

The Mosier Mounds Complex (Smithsonian trinomial: 35WS274), also known locally as the Mosier Battlements, is an archaeological site near Mosier, Oregon, United States. This collection of stone walls, pits, and mounds amid a basalt talus slope is the largest and most complex of a number of similar Native American sites in the southern Columbia Plateau. The site predates the arrival of Europeans and probably the local ascendance of Chinookan peoples, but has resisted more precise dating or cultural affiliation.{{citation | last = Anderson | first = Kirsten J. | last2 = Connolly | first2 = Tom | title = National Register of Historic Places Registration Form: Mosier Mounds Complex | date = November 20, 2001 }}.

The site was added to the National Register of Historic Places in 2003.{{Citation | last = Oregon Parks and Recreation Department | author-link = Oregon Parks and Recreation Department | title = Oregon Historic Sites Database | url = http://heritagedata.prd.state.or.us/historic/ | accessdate = June 18, 2014}}.