Mainichi Film Award for Best Supporting Actor

{{Infobox award

| name = Mainichi Film Award for Best Supporting Actor

| image =

| caption =

| awarded_for = Best supporting actor of the year

| presenter =

| country = Japan

| location =

| year = 1952

| year2 =

| holder =

| website =

}}

The Mainichi Film Award for Best Supporting Actor is a film award given at the Mainichi Film Awards.{{cite news |url=http://mainichi.jp/enta/cinema/mfa/etc/history/|title=コンクールの歴史|trans-title=History of Mainichi Film Award|accessdate=2015-04-19|publisher=The Mainichi Newspapers|language=Japanese}}{{cite news |url=https://www.imdb.com/event/ev0001002/|title=Mainichi Film Concours|accessdate=2015-04-19|publisher=IMDb.com, Inc.|language=Japanese}}