Jānis Lūsis (19 May 1939 – 29 April 2020)[2][3] was a Latvian track and field athlete who competed in javelin throw.

Germany's Klaus Wolfermann had taken the lead from Lūsis in the fifth round with an Olympic Record throw of 90.48 meters.

Then, in the sixth and final round, Lūsis let fly with a very long effort that measured at 90.46 meters - Wolfermann's two-centimeter margin was, at the time, the smallest unit of measurement used in javelin competitions.

As of 2020[update], he remains the only Latvian to have won an all three classes of Olympic medals (gold, silver and bronze) over the span of his career.

He was married to Elvīra Ozoliņa, the 1960 Olympic female champion in the javelin throw.