Sinnett Octagon House

{{short description|Historic house in Iowa, United States}}

{{Use mdy dates|date=January 2025}}

{{Infobox NRHP

| name = Sinnett Octagon House

| nrhp_type =

| image = MuscatineIA SinnettOctagonHouse.jpg

| caption =

| nearest_city = Muscatine, Iowa

| coordinates = {{coord|41|27|11|N|91|1|50|W|display=inline,title}}

| locmapin = Iowa#USA

| area =

| built = 1855

| architect =

| architecture = Greek Revival, Octagon Mode, Italian Villa

| added = July 18, 1974

| refnum = 74000802{{NRISref|2008a}}

}}

The Sinnett Octagon House built in 1855 is a historic octagonal house in Muscatine, Iowa. The two-story brick home with wrap-around porch and windowed cupola is now used as an office building.{{cite web| last = Travis| first = Dale| title = Iowa Round Barns List| date = March 10, 2008| url = http://www.dalejtravis.com/rblist/rbia.htm| accessdate =2008-06-20}}

On July 18, 1974, it was added to the National Register of Historic Places.