Clay Township is one of fourteen townships in Morgan County, Indiana, United States. As of the 2010 census, its population was 4,292 and it contained 1,707 housing units.

The township contains the incorporated towns of Brooklyn and Bethany, and the unincorporated town of Centerton. The entire township lies within the Metropolitan School District of Martinsville, with elementary schools at both Brooklyn and Centerton.

Clay Township is also home to the Goethe Link Observatory and Bradford Woods, both affiliated to Indiana University.

Fire protection is provided to the township by the Brooklyn Volunteer Fire Department, which operates stations in Brooklyn and on Robb Hill Road.

The Franklin Landers-Black and Adams Farm and Bradford Estate are listed on the National Register of Historic Places.

According to the 2010 census, the township has a total area of 30.66 square miles (79.4 km), of which 29.99 square miles (77.7 km) (or 97.81%) is land and 0.67 square miles (1.7 km) (or 2.19%) is water.

• Bethany
• Brooklyn

• Beech Grove at 39°31′02″N 86°26′47″W / 39.51727°N 86.446384°W / 39.51727; -86.446384
• Center Valley at 39°30′49″N 86°24′32″W / 39.513659°N 86.408883°W / 39.513659; -86.408883
• Centerton at 39°30′54″N 86°23′42″W / 39.515048°N 86.394994°W / 39.515048; -86.394994

(This list is based on USGS data and may include former settlements.)

The township contains these two cemeteries: Brooklyn and Butterfield.

• Indiana State Road 67

• Hilhon Airport

• Jewel Lake
• Old Swimmin Hole Lake

• Metropolitan School District of Martinsville Schools

• Indiana's 4th congressional district
• State House District 47
• State Senate District 37

• "Clay Township, Morgan County, Indiana". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved September 26, 2009.
• United States Census Bureau 2008 TIGER/Line Shapefiles
• IndianaMap

• Indiana Township Association
• United Township Association of Indiana
• City-Data.com page for Clay Township