Waldo Block

{{Short description|Historic building in Portland, Oregon, U.S.}}

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

{{Infobox NRHP

| name = Waldo Block

| nrhp_type =

| designated_other1_name = Portland Historic Landmark{{citation|author=Portland Historic Landmarks Commission|title=Historic Landmarks -- Portland, Oregon|format=XLS|date=July 2010|url=http://www.portlandonline.com/planning/index.cfm?c=44013&a=146276|accessdate=November 13, 2013}}.

| designated_other1_color = lightgreen

| image = Waldo Block from southeast in 2018.jpg

| caption = Seen from the southeast in 2018

| location = 431–433 SW 2nd Avenue
Portland, Oregon

| coordinates = {{coord|45.519526|-122.674031|region:US-OR_type:landmark|format=dms|display=inline,title}}

| locmapin = USA Portland downtown#Oregon#USA

| built = 1886

| architecture = Italianate

| added = April 29, 1982

| area = {{convert|0.1|acre}}

| refnum = 82003746 {{NRISref|version=2009a}}

}}

The Waldo Block, located in downtown Portland, Oregon, is listed on the National Register of Historic Places.{{cite web|title=Oregon National Register List|publisher=Oregon Parks and Recreation Department|url=http://www.oregon.gov/OPRD/HCD/NATREG/docs/oregon_nr_list.pdf|page=41|format=PDF|date=June 6, 2011|accessdate=August 27, 2012|archive-date=June 9, 2011|archive-url=https://web.archive.org/web/20110609105953/http://www.oregon.gov/OPRD/HCD/NATREG/docs/oregon_nr_list.pdf|url-status=dead}}

The building's ground floor houses Mama Mia Trattoria.