Secret Treaties is the third studio album by American rock band Blue yster Cult, released in 1974. It features the same band members and production team as their previous album Tyranny & Mutation, but also the only BC album that does not feature a track with lead vocals sung by guitarist Donald “Buck Dharma” Roeser.

Lyrics to the lead-off track “Career of Evil” were written by future punk poet Patti Smith, a longtime contributor to the band (and, at the time, girlfriend of BC keyboardist and rhythm guitarist Allen Lanier). The album spent 14 weeks in the US album charts, peaking at No. 53. It was certified Gold by the RIAA.

In 1975, a poll of readers of the British magazine Melody Maker voted Secret Treaties the “Top Rock Album of All Time”. In 2010, Rhapsody called it one of the all-time best “proto-metal” albums.

Secret Treaties is available on black vinyl and includes an insert.