Donald Crowdis (December 24, 1913 – November 27, 2011) was a Canadian educator, museum curator, broadcaster, and one of the world's oldest bloggers.
He created The Nature of Things for CBC Television in 1960, which remains one of the longest running and most successful programs in Canada, and was a member of the executive team which oversaw the establishment of the Ontario Science Centre.
He served at the museum for 25 years, focusing on the growth of its science collections until his departure in 1965. Notable initiatives included the creation of the first public planetarium in Canada, and live exhibits aimed at attracting children, including the development of innovative fish tanks which would come to be emulated elsewhere by public aquariums.
Frustrated that the Nova Scotia Museum was overlooked for such funding in favor of a competing initiative, Crowdis moved to Toronto in 1965.
Late in his life (from age 91 to 95),[8] he wrote a blog named Don To Earth, making him Canada's, and one of the world's, oldest bloggers.