Othmar, also spelled Otmar or Ottmar, is a masculine German given name, derived from the Germanic name Audamar, from the elements aud "wealth, prosperity" and mar "fame".

Notable people with the name include:

• Saint Othmar, medieval monk and priest
• Othmar Ammann, Swiss-American structural engineer
• Otmar Emminger, German economist
• Otmar Freiherr von Verschuer, German-Dutch human biologist and geneticist
• Otmar Hasler, Prime Minister of Lichtenstein (2001–2009)
• Ottmar Hörl, German conceptual artist, sculptor, installation, action, photography, and object artist
• Ottmar Hitzfeld, German football player and manager
• Otmar Issing, German economist
• Othmar Karas, Austrian politician
• Ottmar Liebert, German guitarist, songwriter and producer
• Ottmar Luscinius, German humanist
• Ottmar Mergenthaler, German-American inventor
• Othmar Muller von Blumencorn, Swiss sailor
• Othmar Reiser, Austrian ornithologist
• Othmar Schoeck, Swiss composer
• Othmar Spann, Austrian philosopher
• Otmar Szafnauer, American businessman
• Othmar Zeidler, Austrian chemist

• King Ottmar in the Legacy of Kain series
• Miss Othmar, the unseen teacher with a voice that is the sound of teaching from Charles M. Schulz's comic strip Peanuts

• Ottomar
• Omar (name)
• Otto
• Ademar
• Johann Karl Christoph Nachtigal, published Volcks-Sagen (1800) under the name Otmar

• "Baby names starting with O". Baby Names. Retrieved 9 September 2013.