Nils Gustaf Dalén (Swedish pronunciation: [?g?s?tav da'le?n] (listen); 30 November 1869 – 9 December 1937) was a Swedish Nobel Laureate and industrialist, engineer, inventor and long-term CEO of the AGA company and inventor of the AGA cooker and the Dalén light.
In 1912 he was awarded the Nobel Prize in Physics for his "invention of automatic regulators for use in conjunction with gas accumulators for illuminating lighthouses and buoys".