The Quba Mosque (Arabic: مَسْجِد قُبَاء, romanized: Masjid Qubāʾ) is a mosque located in Medina, in the Hejaz region of Saudi Arabia, built in the lifetime of the Islamic prophet Muhammad in the 7th century C.E. It is thought to be the first mosque in the world, built on the first day of Muhammad's emigration to Medina. Its first stone is said to have been laid by the prophet, and the structure completed by his companions. The mosque was subsequently modified across the centuries until the 1980s, when it was completely replaced by a new buidling that stands today.

According to historical Islamic texts, Muhammad migrated alongside Abu Bakr and spent 14 days in this mosque praying qaṣr (Arabic: قَصْر, a short prayer) while waiting for Ali to arrive in Medina, after he stayed behind in Mecca to safeguard Muhammad's life and escape, by sleeping in Muhammad's bed in his place. Performing Wuḍūʾ ('Ablution') in one's home, then offering two Rakaʿāt of Nafl (Optional) prayers in the Quba Mosque, is considered to be equal to performing one ʿUmrah. Muhammad used to go there, riding or on foot, every Saturday and offer a two rakaʿāt prayer. He advised others to do the same, saying, "Whoever makes ablutions at home and then goes and prays in the Mosque of Quba, he will have a reward like that of an 'Umrah." This ḥadīth was reported by Ahmad ibn Hanbal, Al-Nasa'i, Ibn Majah and Hakim al-Nishaburi.

Initially, the mosque was built 6 kilometres (3.7 miles) off Medina in the village of Quba, before Medina expanded to include this village. The first mosque would have been oriented towards Jerusalem and Muhammad most likely rebuilt it when the qibla (direction of prayer) was changed toward the Kaaba in Mecca.

The mosque was repeatedly modified and expanded in later periods. It was expanded under Caliph Uthman (r. 644 – 656 CE). Another expansion occurred in 684 CE, during the reign of the Umayyad caliph Abd al-Malik ibn Marwan. Under his successor, al-Walid I (r. 705–715), the mosque was rebuilt. Its first "minaret" was added under Umar ibn Abd al-Aziz (r. 717–720).

Another renovation occurred in 1044, when a mihrab (niche symbolizing the qibla) was added by Sharif Abu Ya'la Ahmad ibn Hasan (or Abu Yali al-Husayni). Further additions were made around 80 years later. Later renovations were made by the Zengid vizier Jamal al-Din al-Isfahani in 1160. During the Mamluk era, Sultan al-Nasir Muhammad ibn Qalawun reconstructed the mosque in 1333, the ceiling was redone under al-Ashraf Barsbay in 1436, and Qaytbay made renovations in 1476.

During the Ottoman era, Sultan Suleiman sponsored the reconstruction of the minaret and the mosque's ceiling in 1543. Sultan Mustafa II renovated these same elements again in 1699. Major renovations and modifications took place in 1829 and in the following decade or so during the reigns of Mahmud II (r. 1808–1839) and Abdülmecid I (r. 1839–1861).

The present-day mosque is the result of a complete reconstruction that began in 1984 under Saudi king Fahd bin Abdulaziz. It expanded the mosque's size The Egyptian architect Abdel-Wahed El-Wakil was commissioned to conceive a larger mosque. He initially intended to incorporate the old structure into his design, but it was eventually decided to tear down the old mosque and replace it entirely with the new one.

The original mosque is said to have been a square or rectangular walled enclosure with an open court inside it. In Muhammad's time, a roofed area supported by columns was added on the qibla side. Other historical descriptions of the mosque mostly date from periods after it had already been expanded by others. For much of its history prior to the 1980s reconstruction, it maintained its generally Umayyad form, with a covered prayer hall and an internal courtyard surrounded by galleries with rows of arches.

The Umayyad structure at the time of Umar ibn Abd al-Aziz's renovations (early 8th century) was made from cut stone and lime, with a ceiling made of valuable timber. It was also decorated with mosaics, probably created with the help of Byzantine craftsmen who also worked on a renovation of the Prophet's Mosque in Medina around the same time. According to descriptions in the Abbasid period, such as those of Ibn Shabba [ar], the mosque measured approximately 32 by 32 metres (105 by 105 ft) and contained an interior courtyard measuring around 24 by 12.5 metres (79 by 41 ft), while Its walls were around 9 metres (30 ft) high and its minaret was roughly 24 metres (79 ft).

The early 19th-century renovations initated by Mahmud II replaced the originally flat ceiling of the mosque with a new ceiling of shallow domes supported by arches and columns. Prior to its modern reconstruction, the mosque's western entrance was also fronted by a façade with Ottoman tughras (calligraphic signatures) and an inscription recording Mahmud II's works. In the late 19th century, the writer Ibrahim Rifat Pasha reported that the mosque measured some 40 by 40 metres (130 by 130 ft) with a ceiling around 6 metres (20 ft) high.

The new mosque consists of a rectangular prayer hall raised on a second story platform. The prayer hall connects to a cluster containing residential areas, offices, ablution facilities, shops and a library.

The recent new construction of the Quba Mosque that happened in 1984 include many new additions, such as 7 main entrances, 4 parallel minarets, and the 56 mini domes that surround the perimeter of the mosque from an overhead point of view. The courtyard of this mosque is composed of black, red, and white marble, and majority of the structure and interior structures such as the minbar and mihrab are all composed of white marble. Originally, there was one minaret, the new renovations included the addition of the other three minarets, they rest on square bases, have octagonal shafts which take on a circular shape as they reach the top.

The prayer hall is arranged around a central courtyard, characterised by six large domes resting on clustered columns. A portico, which is two bays in depth, borders the courtyard on the east and west, while a one-bayed portico borders it on the north, and separates it from the women's prayer area.

The women's prayer area, which is surrounded by a screen, is divided into two parts as a passageway connects the northern entrance with the courtyard. When Quba Mosque was rebuilt in 1986, the Medina architecture was retained – ribbed white domes, and basalt facing and modest exterior – qualities that recalls Madina's simplicity. The courtyard, is flagged with black, red and white marble. It is screened overhead by day from the scorching heat with shades. Arabesque latticework filters the light of the palm groves outside. Elements of the new building include work by the Egyptian architect Abdel-Wahed El-Wakil, Pakistani architect Hassan Khan Sayyid and the Stuttgart tensile architect Mahmoud Bodo Rasch, a student of Frei Otto.

• The present-day mosque
• 
  Exterior of the mosque
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  Interior courtyard
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  Interior of the prayer hall
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  The mihrab

The merits of the mosque are mentioned in nineteen Sahih al-Bukhari hadiths; thirteen Sahih Muslim hadiths; two Sunan Abu Dawood hadiths; six Al-Muwatta hadiths.

Muhammad frequented the mosque and prayed there. This is referred to in a number of hadith:

Narrated 'Abdullah bin Dinar: Ibn 'Umar said, "The Prophet used to go to the Mosque of Quba every Saturday (sometimes) walking and (sometimes) riding." 'Abdullah (Ibn 'Umar) used to do the same

— Collected by Muhammad al-Bukhari, Sahih al-Bukhari Volume 2, Book 21, Number 284

Narrated Ibn 'Umar: The Prophet used to go to the Mosque of Quba (sometimes) walking and sometimes riding. Added Nafi Mawla Ibn Umar (in another narration), "He then would offer two Rakat (in the Mosque of Quba)."

— Collected by Muhammad al-Bukhari, Sahih al-Bukhari Volume 2, Book 21, Number 285

It is believed to be the mosque which the Quran mentions as being founded on piety and devoutness (Masjid al-Taqwa)

There are also those ˹hypocrites˺ who set up a mosque ˹only˺ to cause harm, promote disbelief, divide the believers, and as a base for those who had previously fought against Allah and His Messenger. They will definitely swear, "We intended nothing but good," but Allah bears witness that they are surely liars. Do not ˹O Prophet˺ ever pray in it. Certainly, a mosque founded on righteousness from the first day is more worthy of your prayers. In it are men who love to be purified. And Allah loves those who purify themselves.

— Surah At-Tawbah 9:108

• Demolition of Masjid al-Dirar (former mosque near the Quba Mosque)
• Holiest sites in Islam
• Islamic architecture
  • Lists of mosques
    • List of mosques in Saudi Arabia
• Timeline of Muslim history

• Muhammad: The Messenger of Islam by Hajjah Amina Adil (p. 286)
• The Naqshbandi Sufi Tradition Guidebook of Daily Practices and Devotions by Hisham Kabbani (p. 301)
• Happold: The Confidence to Build by Derek Walker and Bill Addis (p. 81)

• Virtues of Masjid Quba, Madina – Taken from Tafsir Ibn Kathir and other Saheeh Hadith