Alan Wright's new look squad will run out home and away with ACH emblazoned across the Port players chests.
Commercial and Community Director Haydn Preece said: " We are delighted to have ACH as our new shirt sponsor at this very exciting time.
“ACH have given the club great backing by coming on board.
“We in turn can provide local, regional and national exposure in the season ahead. This is a major deal for the club and we are all looking forward to working closely with ACH and forging a fantastic long term relationship.”
The club will play in the same colours as last season with the popular Port Nike yellow and black home striped shirt and the sky blue Nike away one.
ACH Managing Director Andrew O'Dua said: "We are proud to sponsor a community focused football club like Southport FC at such an exciting time coinciding with the tenure of Alan Wright and his team.
“ACH Group offers a wide range of legal and insurance services and both ACH and its business partners will be looking to engage with both the club and its supporters over the coming season.”