Post Office Building, Upper Montclair

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

{{Infobox NRHP

| name = Post Office Building, Upper Montclair

| nrhp_type =

| image = Post Office Building, Upper Montclair, New Jersey.jpg

| caption =

| location = 242-244 Bellevue Avenue, Montclair, New Jersey

| coordinates = {{coord|40|50|28|N|74|12|33|W|display=inline,title}}

| locmapin = USA New Jersey Essex County#New Jersey#USA

| built = 1918

| architect = Francis A. Nelson

| architecture = Tudor Revival

| added = July 1, 1988

| area = less than one acre

| mpsub = {{NRHP url|id=64000493|title=Montclair MRA}}

| refnum = 86003012{{NRISref|2009a}}

| designated_other1_name = New Jersey Register of Historic Places

| designated_other1_abbr = NJRHP

| designated_other1_link = New Jersey Register of Historic Places

| designated_other1_date = September 29, 1986

| designated_other1_number = 1190{{cite web | title=New Jersey and National Registers of Historic Places - Essex County | url=http://www.state.nj.us/dep/hpo/1identify/lists/essex.pdf | publisher=New Jersey Department of Environmental Protection - Historic Preservation Office | page=5 | date=April 1, 2010 | accessdate=July 6, 2010 | url-status=dead | archiveurl=https://web.archive.org/web/20110604121630/http://www.state.nj.us/dep/hpo/1identify/lists/essex.pdf | archivedate=June 4, 2011 }}

| designated_other1_num_position = bottom

| designated_other1_color = #ffc94b

}}

Post Office Building, Upper Montclair, also known as the Gumersall Building, is located in Montclair, Essex County, New Jersey, United States. Designed by the architect Francis A. Nelson, the building was built in 1918 and was added to the National Register of Historic Places on July 1, 1988.