Tadija Kačar (born January 16, 1956 in Perućica, Jajce) is a retired boxer from the former Yugoslavia, who represented his native country 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.
Two years later 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.
- Won the silver medal as a Light middleweight at the 1976 Olympic Games. Results were:
- Kačar captured the silver medal at the 1978 World Championships in Belgrade. His results were: