The Gazi Omer Bey Mosque or the Mosque of the Bazaar is located in the historic center of the city, at the intersection of General Ioannou and Tsoga streets. It dates back to the second half of the 15th century AD. Omer Bey conquered Livadeia in 1460 AD and therefore he was given the title of Gazi. The word is Arabic and means fighter. As a devoted Muslim he built a mosque, which was to be the center of Islamic life in the region for three and a half centuries.

There were three Ottoman mosques on today`s Stratigou Ioannou Street that served the religious needs of the Muslim population during the Ottoman rule in Livadeia. Today, only the Mosque of Gazi Omer or the Mosque of the Bazaar is preserved. This was the site of the commercial center and the most densely populated district of the city.

From the mosque it is possible to see the dome among newer constructions. In particular is preserved the main place of worship, a square hall covered with a dome, while on the outside, newer buildings have been attached that differ the volume and form of the building

Since 2015 the mosque belongs to the municipality. The aim is the restoration, maintenance, promotion and use of the monument as a cultural site of the Μunicipality.