Liddle took over the reigns with the Seasiders in October on an interim basis.
The team was struggling for form in the Pitching In Northern Premier League, however he, alongside Assistant Manager Jason Kennedy, has earned plenty of respect from the Board of Directors from his positive and professional approach to the role.
Gary Liddle said: "I'm really pleased and excited to have been given the opportunity by Ivor and the Board members to take Whitby Town forward into 2025/26.
"I've thoroughly enjoyed my 15 games in charge so far, and feel the steady progression we have shown as a team can continue over my time here.
"With 15 games remaining in a really tight league, we will continue, with your support, to get to where we want to be and look forward to a fresh start next season with real excitement."
You can show your support for Gary Liddle and the Seasiders in his first match since agreeing a new deal next Saturday where Morpeth Town are the visitors to the Towbar Express Stadium (3pm kick-off). Click here for tickets.