Abyek County () is in Qazvin province, Iran. Its capital is the city of Abyek.
In 2020, the villages of Qeshlaq and Ziaran were converted to cities.
The majority of Abyek County's people are Azerbaijani Turks.
At the time of the 2006 National Census, the county's population was 89,334 in 23,132 households. The following census in 2011 counted 93,844 people in 26,944 households. The 2016 census measured the population of the county as 94,536 in 29,234 households.
Abyek County's population history and administrative structure over three consecutive censuses are shown in the following table.