Herman (Hermann) Jadlowker (17 July 1877, in Riga – 13 May 1953, in Tel Aviv) was a leading Latvian-born dramatic tenor of Russian (later Israeli) nationality who enjoyed an important international career during the first quarter of the 20th century.

His virtuoso recordings of arias from Idomeneo and The Barber of Seville, among others, are considered by some to be classics of the gramophone, although reviews of his operatic performances, especially during his brief tenure in New York with the Metropolitan Opera, were decidedly mixed.

In 1910 and 1912, Jadlowker appeared at the New York Metropolitan Opera House, where he proved to be one of the company's most versatile artists in the major German, Italian, and French roles although his performances were overshadowed by those of Enrico Caruso and Leo Slezak.

His agile vocal technique enabled him to sing runs, trills and other coloratura embellishments with astonishing ease and accuracy (although the basic timbre of his voice was not sweet or seductive).

Most of these recordings—which include arias by composers as diverse as Mozart, Auber, Verdi, Rossini and Wagner—can be heard on CD reissues, mainly on the Marston and Preiser labels.