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Grand Mosalla of Tehran

Imam Khomeini Mosalla of Tehran
مصلای امام خمینی تهران
The Mosalla in 2025
Islam
.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}Friday mosque;Community center
Active;(despite incomplete)
Ruhollah Khomeini
Abbas Abad, Tehran, Tehran Province
.mw-parser-output .locmap .od{position:absolute}.mw-parser-output .locmap .id{position:absolute;line-height:0}.mw-parser-output .locmap .l0{font-size:0;position:absolute}.mw-parser-output .locmap .pv{line-height:110%;position:absolute;text-align:center}.mw-parser-output .locmap .pl{line-height:110%;position:absolute;top:-0.75em;text-align:right}.mw-parser-output .locmap .pr{line-height:110%;position:absolute;top:-0.75em;text-align:left}.mw-parser-output .locmap .pv>div{display:inline;padding:1px}.mw-parser-output .locmap .pl>div{display:inline;padding:1px;float:right}.mw-parser-output .locmap .pr>div{display:inline;padding:1px;float:left}@media screen{html.skin-theme-clientpref-night .mw-parser-output .od,html.skin-theme-clientpref-night .mw-parser-output .od .pv>div,html.skin-theme-clientpref-night .mw-parser-output .od .pl>div,html.skin-theme-clientpref-night .mw-parser-output .od .pr>div{background:#fff!important;color:#000!important}html.skin-theme-clientpref-night .mw-parser-output .locmap img{filter:grayscale(0.6)}html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data .locmap div{background:transparent!important}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .locmap img{filter:grayscale(0.6)}html.skin-theme-clientpref-os .mw-parser-output .od,html.skin-theme-clientpref-os .mw-parser-output .od .pv>div,html.skin-theme-clientpref-os .mw-parser-output .od .pl>div,html.skin-theme-clientpref-os .mw-parser-output .od .pr>div{background:white!important;color:#000!important}html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data .locmap div{background:transparent!important}}Location of the incomplete mosque in Tehran
.mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-parser-output .geo-multi-punct,.mw-parser-output .geo-inline-hidden{display:none}.mw-parser-output .longitude,.mw-parser-output .latitude{white-space:nowrap}35°44′05″N 51°25′31″E / 35.7348404°N 51.425354°E / 35.7348404; 51.425354
Parviz Moayed Ahd
Mosque architecture
Persian-Islamic
1982
1990
Under construction
c.IR 100 trillion(as of 2017) (c.US$3 billion)
223,500 m2 (2,406,000 sq ft)
One
63 m (207 ft)
54 m (177 ft)
Two (maybe more)
135 m (443 ft)
c. 263 ha (650 acres)
Concrete
1,321 m (4,334 ft)
musalla.ir

The Grand Mosalla of Tehran, officially the Imam Khomeini Mosalla of Tehran (Persian: مصلای امام خمینی تهران), is a partially completed Friday mosque (jāmeh) and associated community complex, located near Abbas Abad in the city of Tehran, in the province of Tehran, Iran. The mosque is used for hosting weekly Friday prayer (jāmeh), as well as cultural, political, educational, worship activities, including book fairs, exhibitions, and religious ceremonies.

The Persian-Islamic style mosque has been under construction since the 1990s. Upon completion, the mosque will have the world's biggest iwan. When completed, the mosque will surpass the Masjid al-Haram in Mecca, as of April 2025, the world's largest mosque.

The Grand Mosalla Mosque originated in a 1982 proposal to replace the University of Tehran as the primary location for weekly Friday prayer. A large section of land in Abbas Abad, the original site for the never-materialized pre-Revolution megaproject Shahestan Pahlavi, was allocated for the Grand Mosalla.

On 19 February 1985, a public announcement was issued, calling on talented and experienced designers to submit drafts for the mosque's design. The competition was held in 1986 with Mohammad Karim Pirnia, Mehdi Chamran, Bagher Ayatollahzadeh Shirazi, Ali Ghaffari, and Mehdi Hodjat as the jury members, and with the participation of 36 native and foreign individuals from Japan, Syria, Pakistan, and the Netherlands, as well as legal entities. On 1990, Dr. Parviz Moayed Ahd's design was confirmed for the Mosalla.

As of April 2025, more than 30 years after the design was finalized, the Grand Mosalla remained under construction, though finished sections of the building were in use. In 2017, the Financial Tribune called the condition of the project "dismal" and "unacceptable", and Governor General of Tehran Province Hussein Hashemi urged Tehran City Council to prioritize the mosque's completion.

Shabestan of the Grand Mosalla during the 23rd Tehran International Book Fair

The Grand Mosalla Mosque is used for Friday prayer (jāmeh) and during Eid al-Fitr. Ayatollah Seyyed Ali Khamenei has led prayers at the mosque in 2024 and 2025 and the mosque was a focal point for worship following the sudden death of Iranian President, Ebrahim Raisi.

The mosque complex is also used as a community center and a venue for local and national events, including the Tehran International Book Fair, International Holy Quran Exhibition, International Exhibition of Investment Opportunities in Iran's Mines and Mining Industries, International Handicrafts Exhibition, and the Tehran Game Exhibition, among other events.

The Grand Mosalla Mosque is served by the Mosalla Imam Khomeini Metro Station, a Tehran Metro station located in the Grand Mosalla, next to the Qasem Soleimani Expressway. It also has a bus rapid transit station in Line 5: Science & Tech Terminal to Argentina Square Beihaghi Terminal.

Ali Khamenei worshipping at the mosque during Eid al-Fitr in 2025
Islam in Iran
List of mosques in Iran
List of largest mosques
Jamaran Hussainiya, house of Ruhollah Khomeini
Mausoleum of Ruhollah Khomeini
Official website
"The Grand Mosalla of Tehran". Contemporary Architecture of Iran. May 1, 2020. (Includes images and text on the project's progress).{{cite web}}: CS1 maint: postscript (link)

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