John Wishart (died 1338) was a 14th-century bishop of Glasgow.
After the death of Bishop John de Lindesay in 1335, John was elected to succeed him at Glasgow, and was consecrated in February 1337 at the orders of Pope Benedict XII at Avignon by Annibald de Ceccano, bishop of Tusculum.
His exact death date is not known, but we know that the see was again vacant on 11 May 1338.
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