Ivan Ivančić (6 December 1937 – 28 August 2014) was a Croatian athletics coach and shot putter who represented Yugoslavia.

[5][6] In addition, he represented Yugoslavia in the 1972 and 1976 Summer Olympic Games and in the 1983 World Championships in Athletics in Helsinki, placing 19th, 16th and 12th respectively.

His appearance in the shot put final in Helsinki, at the age of 45 years 244 days, makes Ivančić the oldest ever World Championships competitor in shot put, as well as the oldest ever World Championships finalist in any event.

[7] On 31 August 1983 in Koblenz, less than a month after the Helsinki final, Ivančić set his personal best of 20.77 m.[2][8][9] As of 2012[update], this is the world masters record in the M45 category (men 45–49 years of age); no other athlete in this age category has managed to come within two and a half meters of this mark.

[11] Ivančić entered into coaching in the 1970s, while still actively competing, working with Vladimir Milić and Jovan Lazarević, gold medalists in shot put for Yugoslavia at the Mediterranean Games in 1979 and 1983, respectively.