Sadler is a city in Grayson County, Texas, United States. The population was 404 at the 2000 census. It is part of the Sherman–Denison Metropolitan Statistical Area.
Sadler is located at 33°40′53″N 96°50′47″W / 33.68139°N 96.84639°W / 33.68139; -96.84639 (33.681387, -96.846321).
According to the United States Census Bureau, the city has a total area of 0.6 square miles (1.6 km²), all of it land.