Jan Weinzierl (born 1 May 1973) is a former professional tennis player from Germany.

Weinzierl, a right-handed player, grew up in Biberach an der Riss.

His two ATP Tour main draw appearance came eight years apart.

In 1995 he lost in the final round of qualifying at the Seoul Open but entered the draw as a lucky loser, where he was beaten in the first round by Paul Wekesa.

[2] He featured as a lucky loser again when he played at the 2003 International Raiffeisen Grand Prix in Sankt Pölten and lost in the first round to Irakli Labadze in three sets.