Bid Khun (Persian: بيدخون) is a city in the Central District of Asaluyeh County, Bushehr province, Iran.

At the 2006 census, its population was 1,890 in 461 households, when it was a village in Asaluyeh Rural District of the former Asaluyeh District of Kangan County. The following census in 2011 counted 5,269 people in 1,305 households. The latest census in 2016 showed a population of 8,886 people in 2,071 households, by which time the district had been separated from the county in the establishment of Asaluyeh County. It was the most populous village in its rural district.

After the census, Bid Khun was elevated from village to city status.