St. Martin's Episcopal School is located in DeKalb County's north Brookhaven neighborhood at 3110-A Ashford Dunwoody Road.
From I-85 North, exit at N. Druid Hills Rd. and go north (follow signs for Oglethorpe University). Turn right onto Peachtree Road and follow to Ashford Dunwoody Road. Turn left on Ashford Dunwoody. St. Martin's driveway is one block down on the left.
From I-285, exit at Ashford Dunwoody and head south. After crossing Johnson Ferry Road, St. Martin's is approximately 1 mile down on the right, at the corner of Windsor Parkway and Ashford Dunwoody Road.
The school campus is located behind St. Martin in the Fields Episcopal Church, close to Lanier Drive. Visitor parking is located near the flagpole in the parking lot. All visitors should enter Warrior Hall, which houses the reception desk, the main administrative office and admissions.