Delta Tau Delta (ΔΤΔ) is a U.S.-based international secret letter college fraternity. Delta Tau Delta was founded in 1858 at Bethany College, Bethany, Virginia, (now West Virginia). It currently has around 125 student chapters nationwide, as well as more than 25 regional alumni groups. Its national philanthropic partner is the diabetes research organization JDRF. The fraternity celebrated its 150th anniversary in Pittsburgh, Pennsylvania, at the 2008 Karnea (international convention).