Johan Mikael Wallberg (born 18 March 1977 in Karlsborg, Sweden) is a former freestyle swimmer from Sweden.
He competed twice at the Summer Olympics for his native country, in 1996 and 2000, both in the Men's 4 × 100 m freestyle relay.
After his active career he became coach for Swedish swimmer Therese Alshammar.
During the autumn of 2016, he became coach for Sarah Sjöström.
[1] This biographical article related to a Swedish swimmer is a stub.