Avdan is a neighbourhood (mahalle) in the municipality and district of Keles, Bursa Province, in northwestern Turkey. It is a small rural settlement located in the mountainous region of the district.
- Country: Turkey
- Province: Bursa
- District: Keles
- Coordinates: 39°46′43″N 29°12′13″E
- Elevation: 872 metres (2,861 ft)
- Population: 106 (as of 2022)
- Time zone: UTC+3 (Turkey Time, TRT)
The village is situated in the southern part of Bursa Province, within the historical and geographical region of Marmara. Like many neighbourhoods in the Keles district, Avdan is a small, rural community whose economy is traditionally based on agriculture and livestock.
