Bertha Boronda (née Zettle; March 14, 1877 – January 18, 1950) was an American woman who sliced off her husband's penis in 1907. She was convicted of the crime of mayhem; she used a straight razor to slice off her husband's penis. She fled the scene of the crime, but was captured the next day. Boronda was tried, convicted and imprisoned at San Quentin Penitentiary.