Masuiyama Daishiro (born 16 November 1948 as Noboru Sawada) is a former sumo wrestler and coach from Hyogo, Japan.
In 1980 he became the oldest wrestler to be promoted to the rank of ozeki in the modern era (since 1958).
After retiring from active competition in 1981 he became a sumo coach and an elder of the Japan Sumo Association under the name Mihogaseki and produced several top division wrestlers as head of Mihogaseki stable before stepping down upon reaching age 65 in 2013.