- Eastern Musk Turtle (Stinkpot)*
- Eastern Mud Turtle
- Eastern Box Turtle
- Spotted Turtle*
- Northern Diamond-backed terrapin
- Painted Turtle
- Red-eared Slider (introduced)
- Northern Red-bellied Cooter
- Eastern Snapping Turtle
- Loggerhead Sea Turtle*
- Kemp's Ridley Sea Turtle*
- Green Sea Turtle*
- Leatherback Sea Turtle*
- Atlantic Hawksbill Sea Turtle*
*The Maryland Herp Atlas requires photographic or recorded (frogs) verification of these species.