The Diamond State Athletic Conference is a high school sports conference comprising public, charter, and private schools in Delaware. Historically, the conference consisted of schools from Lower Delaware and existed until the 1969-70 school year when the Henlopen Conference was formed. The current conference was organized in 2007 and features schools found in New Castle County.
Current members include:
In the 2017-2018 school year, the Charter School of Wilmington, Red Lion Christian Academy, First State Military Academy, and the MOT Charter School will join the conference while Wilmington Christian will depart. Seven of the eight schools in the conference are classified by DIAA as Division II schools (Wilmington Charter is classified as a Division I school).