Theodorus "Theo" Adrianus de Lange (born 16 March 1960 in Kralingen, Rotterdam) is a sailor from the Netherlands, who represented his country at the 2018 Vintage Yachting Games in Hellerup Denmark. De Lange as middleman together with helmsman Rudy den Outer and on the foredeck took the Gold medal in the Soling. During the 2019 North American Championship in Kingston, Ontario, De Lange again as middleman in the Dutch Soling Sophie’s Choice together with helmsman Rudy den Outer but now with on the foredeck took first place. This was the first time European sailors won this championship in the over fifty years history of the North American Soling Championship!