The Sayed al-Hashim Mosque (Arabic: مسجد السيد هاشم Masjid as-Sayed Hāshim; Turkish: Seyyid Haşim Camii) is one of the largest and oldest mosques in Gaza, located in the ad-Darrāj Quarter of the Old City, off of al-Wehda Street.

The tomb of Hashim ibn Abd al-Manaf, Muhammad's great grandfather who died in Gaza during a trading voyage, is located under the dome of the mosque according to Muslim tradition.

The Sayed al-Hashim Mosque was frequented by visiting traders from Egypt, Arabia and Morocco.

[1] The existing mosque was built in 1850, on the orders of the Ottoman sultan Abdul Majid.

The original Ottoman minaret was rebuilt in 1903 and the north and west aisles were also built during the same period.