Haroutioun Hovanes Chakmakjian (20 October 1878, in Adana, Ottoman Empire - 22 May 1973, in Jamaica Plain, Massachusetts, United States) was a published scientist, as well as the father of American composer Alan Hovhaness.
A professor of chemistry at Tufts University, Chakmakjian wrote numerous books in several languages.
His notable publications included an English-Armenian dictionary which is believed to be the first of its kind in the modern Armenian language.
The dictionary has become an enduring work of Armenian lexicography and remains regularly used today.
His other publications included a 700-page history of Armenia.