Toivo Nestori Aro (born Toivo Nestori Ahlstedt, 9 February 1887 – 8 October 1962) was a Finnish sports leader and an aquatics athlete who won 10 Finnish championships.

[7] Aro won ten Finnish national championship golds in aquatics: He was a member of eight clubs, all Helsinki-based:[7] Aro was a board member of the International Ski Federation in 1926–1930.

[12] He was the founding member of Suomen Latu, a national non-profit organisation for promoting outdoor recreation and physical activities, and its inaugural chairman in 1938.

[7] His parents were Henrik Gustav Aro Ahlstedt and Mariaana Karoliina Forsell.

They had six children:[17] He was the chief executive officer of the bank Helsingin Suomalainen Säästöpankki in 1925–1957.