In a 1999 Wicked World interview with Haughm and Walton, done by Dan Tobin, the band members listed influences including Katatonia, Ulver, The 3rd and the Mortal, Swans and Godspeed You!
Čeprav ljudje Agalloch pogosto označujejo kot folk ali doom metal, njihova glasba vsebuje tudi druge pogoste vplive, kot so neofolk, dark ambient in postrock.