Gustav Gerneth (born 15 October 1905) is a German supercentenarian who is, at the age of 112 years, 107 days, Germany's oldest living person since the passing of Herta Oeser on 13 March 2016 and Germany's oldest living man since the passing of 108-year-old Erich Walde on 5 August 2013. He is currently unverified. He is also the second-oldest German man ever, behind Hermann Dornemann.