Bertha Idaho (born c. 1895; date of death unknown) was an American classic female blues singer. She recorded four songs in 1928 and 1929. Little is known of her life outside music.
Idaho's work might have remained obscure but for two factors: she was mentioned by John Fahey in the liner notes for his influential debut album, Blind Joe Death, and her recordings were reissued by Rosetta Reitz.