Clark, 46, lost his last job at Bury in October 2017, and was rumoured to be in the running for the hot-seat at Edgar Street prior to the arrival of Marc Richards.
The National League North club will need a rapid re-building period as the outgoing Spartans boss, Alun Armstrong, has already snapped up Jamie Holmes, David Atkinson, Jarrett Rivers and Michael Liddle and signed them on at his new club – Darlington.
Clark has managed in England at Birmingham, Huddersfield, Blackpool and Bury, and north of the border with Kilmarnock.
“I’ve been too long out the game and it’s an opportunity to be at home around my family at a great club with great tradition,” said Clark.
“When they contacted me, I was honoured.”
The Spartans are believed to be cost-cutting ahead of the new campaign after losing out to Altrincham in the National League North play-off’s, and so it could be tough trying to emulate the sixth position Blyth achieved last term.
Image: Blyth Spartans FC