Siegfried Mehnert (born 3 March 1963 in Schenkenberg, Delitzsch, Bezirk Leipzig) is a former amateur boxer from East Germany. He is best known for twice winning the European title (1985 and 1989) in the men's welterweight (– 67 kg) division. He also competed at the 1988 Seoul Olympics.

Below is the Olympic record of Siegfried Mehnert, an East German welterweight boxer who competed at the 1988 Olympics in Seoul.

• Round of 64: defeated Jose Ortiz (Puerto Rico) by decision, 5–0
• Round of 32: defeated Abdellas Taouane (Morocco) by decision, 5–0
• Round of 16: lost to Song Kyung-Sup (South Korea) by decision, 2–3

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