Leigertwood told the club's official website: "I'm delighted. I've really enjoyed my two-and-a-half years here so far and I'm really pleased to be extending my stay with the club.
"This club means a great deal to me and I am really settled here.
"I genuinely believe there's a very bright future at the club and I want to be part of it."
On Tuesday's clash at Loftus Road, he added: "The Rangers fans can be our 12th man when they're in top form, so hopefully they can cheer us on to a victory and a place in round four."