奥尔汉加济是土耳其的城镇，位于该国西北部伊兹尼克湖畔，由布尔萨省负责管辖，始建于1362年，面积603平方公里，该地区自6,000年前有人类居住，2010年人口55,688。

Orhangazi is a rural district of Bursa Province in Turkey. It was founded by Orhan I of the Ottoman dynasty in 1362.

In 2000, Orhangazi had a population of 44,000. Orhangazi has a number of villages around it, there is a local bus garage to take visitors to them. One of the villages, Keramet, has a natural hot springs. Main roads leading to the villages have olive fields on both sides.