Tadija Kačar (born 5 January 1956 in Peručica, near Jajce, Bosnia and Herzegovina) is a retired Bosnian Serb boxer who represented Yugoslavia at the 1976 Summer Olympics in Montréal, Canada.

There he won the silver medal in the light middleweight division (– 71 kg), after being defeated in the final by Poland's Jerzy Rybicki.

Tadija Kačar captured the silver medal at the second World Championships in Belgrade.

He is the older brother of boxer Slobodan Kačar, who won a gold medal at the 1980 Summer Olympics.

This biographical article related to Bosnia and Herzegovina boxing is a stub.