Hermann Otto Ludwig Weingärtner (27 August 1864 – 22 December 1919) was a German gymnast.

[2] He also won a number of individual medals, taking the gold in the horizontal bar, silver in pommel horse and rings, and bronze in the vault.

His six medals arguably made him the most successful competitor at the first modern Olympic Games.

After his return to Germany he and most of the other German gymnasts were suspended because the Deutsche Turnerschaft (at this time the governing body of German gymnastics) boycotted the Olympic games with the reason that competing is "un-German".

[further explanation needed] So he moved back to Frankfurt (Oder) to manage the open-air swimming pool founded by his father on the Ziegenwerder island.