The Mosque of Umar ibn al-Khattab (Arabic: مسجد عمر بن الخطاب) is a Sunni Islam mosque, located within the historic city of Dumat al-Jandal in the Al Jawf Province of Saudi Arabia.

Adjacent to the mosque is the historic Marid Castle which dates from around the 1st century CE.

[2][3] However, the structure of the mosque does not resemble architecture contemporary to the time period of the Rashidun Caliphate, so the attribution of its construction to Umar is considered by some historians to be unreliable.

[1][2][3] In 1793, the Saud family renovated the mosque, as well as rebuilt the prayer hall so that it faced the qibla in a more accurate direction.

[5] The mosque, including the prayer hall and minaret, are made out of brick.