Donald John Arnold (July 14, 1935 – June 27, 2021) was a Canadian competition rower and Olympic champion.

He received a gold medal in coxless fours at the 1956 Summer Olympics in Melbourne, together with Archibald MacKinnon, Lorne Loomer and Walter D'Hondt.

He received a silver medal in eights at the 1960 Summer Olympics in Rome, as a member of the Canadian team.

[2] He died in North Vancouver, British Columbia at the age of 85 from heart failure in 2021.

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