Mack Canyon Archeological Site

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

{{Infobox NRHP

| name = Mack Canyon Archeological Site

| nrhp_type =

| image = Pithouse depression.jpg

| caption = Soil depression marking the location of a pit house at the Mack Canyon Site in 2013

| alt = Photograph of flat ground with dry grass and a shallow, round depression

| location = {{address restricted}}

| nearest_city = Grass Valley, Oregon

| area =

| built = ca. 5000 BCE – ca. 1800 CE

| builder =

| restored =

| restored_by =

| added = August 22, 1975

| refnum = 75001600

| nocat = yes

}}

The Mack Canyon Archeological Site (Smithsonian trinomial: 35SH23) is a prehistoric archeological site in Sherman County, Oregon, United States. Consisting of an extensive series of pit houses in a sheltered canyon, the site was occupied seasonally in winter by Columbia River tribes for about 7,000 years from after 5000 BCE to the early 19th century CE.{{citation | last1 = Cunninghame | first1 = Brian | title = National Register of Historic Places Inventory — Nomination Form for Federal Properties: The Mack Canyon Archeological Site | date = June 7, 1973 | url = http://heritagedata.prd.state.or.us/historic/index.cfm?do=main.loadFile&load=NR_Noms/75001600.pdf | accessdate = March 8, 2016 | format = redacted PDF }}.

The site was added to the National Register of Historic Places in 1975.{{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 = November 21, 2014}}.