Gustav Flatow
|- ! colspan="3" style="text-align:center;vertical-align:middle;background-color:#eeeeee;color:inherit;" | Men's Artistic Gymnastics
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! colspan="3" style="text-align:center;vertical-align:middle;background-color:#eeeeee;color:inherit;" class="adr" | Representing 
Germany
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|| style="text-align:center;vertical-align:middle;" | 1896 Athens|| style="text-align:center;vertical-align:middle;" | Team parallel bars
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| style="text-align:center;vertical-align:middle;color:inherit;" | || style="text-align:center;vertical-align:middle;" | 1896 Athens|| style="text-align:center;vertical-align:middle;" | Team horizontal bar
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Gustav Felix Flatow (January 7 1875 – January 29, 1945) was a German gymnast. He competed at the 1896 Summer Olympics in Athens and at the 1900 Summer Olympics in Paris.
Flatow was born in Berent, West Prussia, and in 1892 moved to Berlin.
Flatow competed in the parallel bars, horizontal bar, vault, pommel horse, and rings individual events. He won no medals, unlike his cousin and teammate Alfred Flatow. However, both were members of the German team that competed in the two team events, for parallel bars and the horizontal bar. As Germany won both those events (the horizontal bar unchallenged), Gustav earned two gold medals. He also competed at the 1900 Summer Olympics in Paris, but without winning medals. He retired from gymnastics to manage his textile company, which he founded in 1899.
Both Flatow and his cousin were victims of the Holocaust at Theresienstadt.
After the Nazi takeover in Germany in 1933, he had to flee to the Netherlands due to being Jewish. When Nazi Germany invaded the Netherlands he was able to hide up until 1943. On New Year's Eve 1943 he was jailed, and in February 1944 he was deported to KZ Theresienstadt, where his cousin had already died in 1942. Less then one year later he starved there at the age of 70. He lost weight up to about 20 kg.
In 1986 journalists detected his urn, which is now entombed in Terezín near the concentration camp.
In 1997 Berlin honoured Alfred and Gustav Flatow by renaming the Reichssportfeldstraße (a lane) near by the Olympic Stadium to Flatowallee (Flatow-avenue). There is also the Flatow-Sporthalle (sports hall) at Berlin-Kreuzberg with a commemorative plaque for both. The Deutsche Post issued a set of four stamps to celebrate the 100th anniversary of the modern Olympic games. One of this stamps shows the Flatows.