Imamzadeh Seyed Morteza

{{Infobox religious building

| building_name = Imamzadeh Seyed Morteza

| native_name = {{lang|fa|امامزاده سید مرتضی}}

| native_name_lang = fa

| religious_affiliation = Shia Islam

| status = Imamzadeh

| functional_status = Active

| image = Imamzadeh Morteza2021-05-14.jpg

| image_upright = 1.4

| caption = The imamzadeh in 2021

| map_type = Iran

| map_size = 250

| map_relief = 1

| map_caption = Location of the tomb in Iran

| coordinates = {{coord|35|17|14|N|58|28|28|E|region:IR_type:landmark|display=it}}

| location = Kashmar, Kashmar County, Razavi Khorasan province

| country = Iran

| website =

| architecture_type = {{nowrap|Islamic architecture}}

| architecture_style = Qajar

| year_completed = 1857 CE

| construction_cost =

| capacity =

| dome_quantity = One

| dome_height_outer =

| dome_dia_outer =

| minaret_quantity = Two

| minaret_height =

| materials = Bricks; mortar

| module = {{Infobox historic site

| embed = yes

| designation1 = INHL

| designation1_offname = Imamzadeh Morteza

| designation1_type = Built

| designation1_date = 24 October 1977

| designation1_number = 1488

| designation1_free1name = Conservation organization

| designation1_free1value = Cultural Heritage, Handicrafts and Tourism Organization of Iran

}}

| footnotes =

}}

The Imamzadeh Seyed Morteza ({{langx|fa|امامزاده سید مرتضی}}; {{langx|ar|مرقد مرتضى الكاظم}}), or simply Imamzadeh Morteza, is a Shi'ite imamzadeh located in Kashmar, in the province of Razavi Khorasan, Iran. It was completed in 1857 CE, during the Qajar era.{{cite web |url=http://iranshahrpedia.ir/docs/Asar-e%20Sabti%20(Up%20to%2026666)%20(Version%2090%2008%2029).zip |title=Encyclopaedia of the Iranian Architectural History |date=19 May 2011 |publisher=Cultural Heritage, Handicrafts and Tourism Organization of Iran |archive-url=https://web.archive.org/web/20150406043613/http://iranshahrpedia.ir/docs/Asar-e%20Sabti%20(Up%20to%2026666)%20(Version%2090%2008%2029).zip |url-status=dead |archive-date=6 April 2015}}

The complex was added to the Iran National Heritage List on 24 October 1977, administered by the Cultural Heritage, Handicrafts and Tourism Organization of Iran. The complex is one of the holiest sites in Twelver Shia Islam.