Crataegus flava, common names summer haw and yellow-fruited thorn,[1] is a species of hawthorn native to the southeastern United States from Virginia to Florida, west to Mississippi.

[4] Because the true identity of this species has only recently been discovered, the name is rarely used correctly.

Individuals with red fruit occur; these have sometimes been assigned to a separate species, Crataegus senta.

[5] Like most hawthorns, plants similar to C. flava bear edible fruit that can be used to make jellies and jams, have a flavor that is mealy and a bit dry, and grow in large clusters.

Also like most hawthorns, the wood of C. flava is hard and can be made into small tools.