Sar Mazdeh () is a neighborhood in the city of Khalilabad in the Central District of Khalilabad County, Razavi Khorasan province, Iran.
At the time of the 2006 National Census, Sar Mazdeh's population was 643 in 173 households, when it was a village in Howmeh Rural District.
After the census, the village was annexed to the city of Khalilabad.