Sad ol Din (; also known as Sa‘d od Dīn and Sa‘d ed Dīn) is a village in Kavir Rural District, Sheshtaraz District, Khalilabad County, Razavi Khorasan province, Iran.

At the 2006 National Census, its population was 1,965 in 533 households. The following census in 2011 counted 1,929 people in 611 households. The latest census in 2016 showed a population of 1,931 people in 646 households; it was the largest village in its rural district.

References 

Khalilabad County

Populated places in Khalilabad County