White, who can play right-back or in centre of defence, is a former Wales under-17 international defender who joins the Bucks having previously played for National League sides Southport and Wrexham.
The Bucks have also secured the signing of former Barrow AFC winger Elliot Newby (pictured).
Newby played junior football locally at a young age before he joined the
academy at Bolton Wanderers.
He was released by the Trotters in the summer of 2015 and joined Barrow after impressing in pre-season games.
The young winger experienced loan spells at Burscough and Altrincham and joins the Bucks as their seventeenth signing of the summer.
Discussing the new signings, manager Rob Smith said: "Ross is a strong defender who is equally at home at right-back or centre-half. I was really impressed with Ross' attitude and character and he will fit into our ethos superbly.
“Elliot is a player I have been keen on for a while. He is an exciting winger with pace and is a player who can get us a few goals throughout the season as well. Elliot is really excited over the move to the club and can’t wait to get started”.
“These are two more exciting youngsters who have the ability to go higher, but their enthusiasm will add to this exciting squad and we can’t wait to get going next week for pre-season training”.