The Magpies will make their first ever visit to the new LNER Community Stadium to face York City with a 2pm (BST) kick-off, as well as taking on League Two side Harrogate Town on the same day (kick-off time to be confirmed).
York are managed by former Newcastle man Steve Watson and the National League North side moved into their new 8,500-capacity ground - which is owned by City of York Council, and is shared with rugby league side York City Knights - in February.
United have only met the Minstermen four times competitively, all in the FA Cup, but Newcastle visited the old Bootham Crescent ground for a friendly in July 2015, losing 2-1 in front of a crowd of 5,406 - 2,048 of them Magpies fans.
Harrogate, who have just enjoyed their first season as a Football League club as well as winning the FA Trophy at Wembley earlier this month, have never played against Newcastle in a competitive match. Their EnviroVent Stadium has a capacity of 5,000.
Ticketing information for both games will be released on nufc.co.uk in due course, along with details of more pre-season friendlies as Bruce's men prepare for another season in the top flight.