Deh Kohneh () is a neighborhood in the village of Baghak-e Jonubi in Baghak Rural District of the Central District in Tangestan County, Bushehr province, Iran.
At the time of the 2006 National Census, Deh Kohneh's population was 230 in 51 households, when it was a village in Baghak Rural District.
In 2010, the villages of Ali Shams ol Din, Bagh-e Salem-e Jonubi, Bagh-e Salem-e Shomali, Deh-e Now, Deh Kohneh, Jovey, Mal Barik, Rameh Char, Shamshiri, and Tokhmari merged to form the village of Baghak-e Jonubi.