Seyuki () is a village in Pain Velayat Rural District of the Central District in Torbat-e Heydarieh County, Razavi Khorasan province, Iran.
At the time of the 2006 National Census, the village's population was 1,135 in 326 households. The following census in 2011 counted 1,145 people in 343 households. The 2016 census recorded a population of the village as 998 people in 343 households.