Stig-Olof Grenner

{{short description|Finnish swimmer}}

{{use dmy dates|date=October 2016}}

{{Infobox swimmer

| name = Stig-Olof Grenner

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| birth_date = {{birth date|1939|5|6|df=yes}}

| birth_place = Helsinki, Finland

| death_date = {{death date and age|2008|3|14|1939|5|6|df=yes}}

| death_place = Helsinki, Finland

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Stig-Olof Grenner (6 May 1939 – 14 March 2008) was a Finnish swimmer. He competed in three events at the 1960 Summer Olympics.{{cite Sports-Reference |url=https://www.sports-reference.com/olympics/athletes/gr/stig-olof-grenner-1.html |archive-url=https://web.archive.org/web/20200417182457/https://www.sports-reference.com/olympics/athletes/gr/stig-olof-grenner-1.html |url-status=dead |archive-date=17 April 2020 |title=Stig-Olof Grenner Olympic Results |accessdate=18 October 2016}}