John Thomas "Sib" Hashian (August 17, 1949 – March 22, 2017) was an American musician, best known as a drummer for the rock band Boston.

Hashian was also the drummer for fellow Boston member Barry Goudreau's self-titled solo album which was released in 1980.

[2] He occasionally played gigs in the Boston area with former bandmates, including Goudreau, Fran Sheehan, and Brad Delp.

In 2001 he made his first stage appearance as an actor at the Cape Cod Repertory Theater in the world premiere of the play 9-Ball written by his friend Art Devine.

[citation needed] On March 22, 2017, at age 67, Hashian died of a heart attack after collapsing in the middle of a set while performing on board a cruise ship, the Independence of the Seas.