The Central District of Dayyer County () is in Bushehr province, Iran. Its capital is the city of Bandar-e Dayyer.
The village of Bardestan was converted to a city in 2010. In 2012, the village of Dowrahak rose to city status as well. In 2013, Owli Rural District was created in the district, and Abdan Rural District and the city of Abdan were separated from it in the formation of Abdan District.
At the time of the 2006 National Census, the district's population was 39,119 in 8,095 households. The following census in 2011 counted 42,765 people in 10,363 households. The 2016 census measured the population of the district as 40,970 inhabitants living in 11,095 households.