The 2015/16 season with be the fourth sponsored by Danske Bank.
"To extend our partnership with Danske Bank is fantastic news for the NIFL, our clubs and our supporters," said NIFL managing director Andrew Johnston.
"Since we formed in 2013, attendances increased 5% in the first year and this season they are up by another 14.5%."
Danske Bank will remain as sponsors of the Irish Premiership for another season after agreeing an extension of its deal with the NI Football League.