John Schofield Guest (28 March 1906 – 12 June 1972) was a Canadian rower who won a silver medal in the double sculls at the 1928 Summer Olympics, together with Joseph Wright Jr.[1][2] Guest started rowing in 1924, and in 1928 already competed in the Diamond Challenge Sculls, which was then an unofficial world championship.

He lost in the semifinals to Wright, and became his double scull partner at the Summer Olympics.

He is honoured by the Jack Guest award, which is given annually to the best Canadian junior single-scull rower.

His son, Jack Guest, Jr., also competed internationally in rowing; he was selected for the 1952 Olympics but had to withdraw due to injury.

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