Sadler is a city in Grayson County, Texas, United States.

The U.S. Route 82 freeway runs through the southern part of the city, leading east 17 miles (27 km) to Sherman, the county seat, and west 5 miles (8 km) to Whitesboro.

According to the United States Census Bureau, Sadler has a total area of 0.73 square miles (1.9 km2), all land.

[4] The climate in this area is characterized by hot, humid summers and generally mild to cool winters.

30.5% of all households were made up of individuals, and 15.0% had someone living alone who was 65 years of age or older.