Imerio Massignan (born 2 January 1937) is an Italian former professional road cyclist. A pure climber, he debuted as professional in the 1959 Giro d'Italia, classifying 5th overall. This was followed by a series of good placements in the subsequent editions, including a 2nd overall in the 1962 Giro behind Franco Balmamion.
At the Tour de France he won the Mountains classification in 1960 and 1961, when he also finished 4th overall. In the latter season he also obtained a second place in the Giro di Lombardia.
Massignan retired in 1969.