The experienced former Ireland international is currently on loan at Saracens, but his deal at Vicarage Road expires at the start of March.
And the Falcons have swooped to sign Stringer, who has made nine appearances since December for Saracens, for the crucial end-of-season run-in.
Saracens boss Mark McCall said: "Peter has been a brilliant addition to the squad, on and off the field, and we are sorry his three-month loan spell will come to an end after our match against Northampton on March 4th."
The 34-year-old, who has been capped 98 times, will be available for Newcastle's game against Harlequins on March 12.
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.