Onesime Eugene "Gene" Vadeboncoeur (September 5, 1859 – April 16, 1893) was a Major League Baseball player.

Vadeboncoeur played for Philadelphia Quakers in the 1884 season.

He played in four games, collecting three hits in 14 at-bats, totaling a .214 batting average.

He is the first native of Quebec to play in Major League Baseball.

This biographical article relating to a Canadian baseball catcher is a stub.