Henri Piet (1 January 1888 – 4 May 1915) was a French Lightweight boxer.

He is notable for his EBU lightweight challenge against Freddie Welsh, winning the French welterweight belt in 1912.

Piet rose to prominence as a lightweight boxer when he challenged Freddie Welsh for the EBU (European) lightweight title.

The fight took place at Mountain Ash on 23 August 1909.

Piet lasted until the twelfth round when his knee gave way and he retired from the fight.