John Anton Blatnik (August 17, 1911 – December 17, 1991) was a United States Congressman from Minnesota.

Blatnik was born in Chisholm, Minnesota, to Slovene immigrant parents.

In 1963, Blatnik, introduced a bill to make Leif Erikson Day a nationwide observance.

[3] He was an early supporter of the Saint Lawrence Seaway and helped develop the original legislation to build it.

The bridge for Interstate 535 crossing the Superior Bay and the Saint Louis Bay between Wisconsin and Minnesota was renamed the John A. Blatnik Bridge in his honor on September 24, 1971.