Michiyasu Osada (長田 道泰, Osada Michiyasu, born March 5, 1978) is a former Japanese football player.

Osada was born in Sayama on March 5, 1978. He joined Verdy Kawasaki (later Tokyo Verdy) from youth team in 1996. Although he debuted in 1997, his opportunity to play was small and he moved to Vissel Kobe in 1999. He played many matches at Vissel. He moved to Kyoto Purple Sanga in 2001. He returned to Tokyo Verdy in 2002. After that, he played for Regional Leagues club Okinawa Kariyushi FC and Shizuoka FC. He retired end of 2004 season.

In August 1993, Osada was selected Japan U-17 national team for 1993 U-17 World Championship. He played full time in all 4 matches. In June 1997, he was also selected Japan U-20 national team for 1997 World Youth Championship, but he did not play in the match.