Former Charlton centre-back Gary Doherty, 34, has signed a two-year deal after enjoying a successful loan spell at Adams Park last season.
Midfielder Matt Spring, 32, leaves Leyton Orient after making over 80 appearances and also signs a two-year deal.
Another player committing himself to the Chairboys for two seasons is 28-year-old Sam Wood. The left-winger was released by Brentford having spent time on loan with Rotherham last term.
Forward Dennis Oli, 28, signs a one-year deal with the option of a further 12 months following his release by Gillingham.
Completing the quintet is 18-year-old winger Lee Angol, who came through the youth academy at Barclays Premier League side Tottenham.