Saints midfielder Davis, who is captain of his country, was influential in helping secure the Green and White Army’s qualification to UEFA EURO 2016 in France this summer.
A captain’s performance and two goals at home to Greece sealed qualification to Northern Ireland’s first major tournament since 1986.
Davis said: “It’s an honour to be crowned the Vauxhall Northern Ireland Player of the Year.
“We had an unbelievable 2015 and to be able to lead this team was just incredible, the spirit of the players and the fans combined helped us get to France.
“The fans were with us every step of the way and the aim now is to do them proud over in France, I’m sure we’ll have the same support we always do. It’s going to be a proud time for everyone associated with the team.”
Davis and Northern Ireland take on Wales in Cardiff on Thursday night, with the game getting under way at 7.45pm GMT.