Delaware Route 26 (DE 26) is a state highway in Sussex County, Delaware. The route's western terminus is at an intersection with Maryland Route 353 (MD 353) and DE/MD 54 at the Maryland border south of Gumboro and its eastern terminus is at a dead end on the Atlantic Ocean in Bethany Beach, even though signage ends at the DE 1 intersection. The route passes through rural areas of southeastern Sussex County along with the communities of Dagsboro, Millville, Ocean View and Bethany Beach. DE 26 intersects DE 30 and DE 54 in the Gumboro area, U.S. Route 113 (US 113) and DE 20 in Dagsboro, and DE 17 west of Millville. The road was built as a state highway in various stages during the 1920s and 1930s. By 1926, DE 26 was assigned onto its current alignment.

DE 26 begins at the Maryland border at an intersection where DE/MD 54 heads west along the state line and MD 353 heads south into Maryland. From the state line, DE 26 heads northeast on two-lane undivided Millsboro Highway concurrent with DE 54. The two routes pass through agricultural areas, intersecting DE 30. At this point, DE 30 turns northeast to form a concurrency with DE 26/DE 54, with the road passing through agricultural areas with some woods and homes. The road curves north and heads into the residential community Gumboro, where DE 54 heads to the east. DE 26/DE 30 continues past more homes, leaving Gumboro and heading back into areas of farms and forests with occasional residences. In Shaft Ox Corner, DE 26 turns east onto Nine Foot Road, running through agricultural areas. The route turns northeast through a mix of fields and woods with some residences and comes to an intersection with US 113. Past this intersection, the road becomes Clayton Street and heads into Dagsboro, passing homes and businesses and crossing Norfolk Southern's Indian River Secondary railroad line. In the center of Dagsboro, DE 26 comes to an intersection with DE 20, at which point it turns south to form a concurrency with DE 20 on Main Street. The two routes pass through more residential areas, curving east and leaving town on Vines Creek Road.

Upon leaving Dagsboro, DE 20 splits from DE 26 by heading southeast on Armory Road. DE 26 continues east on Vines Creek Road, passing through a mix of farmland and woodland with some residential and commercial development. The route turns southeast and comes to the community of Clarksville, where it turns east onto Atlantic Avenue. The road passes through rural areas with some homes and businesses, coming to an intersection with the northern terminus of DE 17. Past this intersection, DE 26 continues into Millville and runs through residential and commercial areas. The road continues east through Ocean View, heading past more development. The route crosses the Assawoman Canal into Bethany Beach and becomes Garfield Parkway. The road passes more homes and businesses and gains a center left-turn lane. The route intersects DE 54 Alt. before coming to a junction with DE 1, at which point DE 26 signage ends. DE 26 officially continues east on four-lane divided Garfield Parkway through the commercial center of Bethany Beach, ending at a dead end at the Atlantic Ocean.

DE 26 has an annual average daily traffic count ranging from a high of 16,225 vehicles at Central Avenue intersection in Ocean View to a low of 3,837 vehicles at the west end of the DE 20 concurrency in Dagsboro. None of DE 26 is part of the National Highway System.

By 1920, what is now DE 26 existed as an unimproved county road. The route was upgraded to a state highway between present-day US 113 and Dagsboro and from Millville to just west of the Assawoman Canal by 1924. By 1925, the road was completed as a state highway between Gumboro and Mission and between Dagsboro and Vines Creek, with the route between the Maryland border and Gumboro and the incomplete sections between Dagsboro and Bethany Beach proposed as a state highway. The proposed segments were completed by 1931. By 1932, the road between Mission and Dagsboro was under construction. When Delaware created its state highway system by 1936, DE 26 was assigned to its current alignment between the Maryland border south of Gumboro and Bethany Beach, where it intersected the southern terminus of DE 14 (now part of DE 1). The route has not changed since its inception.

The entire route is in Sussex County.