| Delmar High School | |
| Streetaddress: | 200 N. Eighth St |
| City: | Delmar |
| State: | Delaware |
| County: | Sussex County |
| Zipcode: | 19940 |
| Country: | United States |
| Coordinates: | 38.4586°N -75.567°W |
| Type: | Public |
| District: | Delmar School District |
| Grades: | 9–12 |
| Superintendent: | Charity H. Phillips |
| Ceeb: | 080025 |
| Principal: | Michael Bleile |
| Enrollment: | 670 (2022-2023)[1] |
| Staff: | 35.00 (FTE) |
| Ratio: | 19.14 |
| Campus Type: | Rural |
| Mascot: | Wildcat |
| Conference: | Henlopen Conference - Southern Division |
| Rival: | Laurel High School |
| Yearbook: | Jostens |
| Colors: | Orange and blue |
Delmar High School is a public high school in Delmar, a community in Sussex County, Delaware.