|* Senior club appearances and goals counted for the domestic league only.
Wilhelm Possak was a Romanian football player and coach.
Possak played club football in Romania for CA Timişoara, and later became Hungarian champion with Újpest FC in 1930/31. After Újpest he signed for Hungarian Vasas SC, and in Portugal for Sporting CP. He also earned two caps for the Romanian national side in 1928, scoring one goal.
Possak managed Sporting CP of Portugal between 1935 and 1937.
- "Romanian footballers who played in Hungarian championships". Romanian Soccer. Retrieved 26 May 2009.
- "Romanian footballers who played in foreign championships from Europe". Romanian Soccer. Retrieved 26 May 2009.
- "Romania National Team 1922-1929 - Details". RSSSF. Retrieved 26 May 2009.
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