Leroy Millar and Andy Ryan scored in either half to seal a victory over 10-man Cliftonville at Inver Park.
It was an impressed first half performance with Millar capping it off with a fine finish from 25 yards to give Larne a half-time lead.
Jamie McDonagh saw red for his second yellow card just before the hour mark.
Andy Ryan scored his first goal at Inver Park, finishing off a fine move from Lee Bonis and Leroy Millar in the final quarter of an hour.
Johnny Addis set-up a grandstand finish with a great finish late on as Larne held on.
Larne: Ferguson, Want (’89 Watson), Sule, Bonis, Donnelly, Bolger, Thomson (’73 Gordon), Millar, Glynn (’73 Kelly), Cosgrove, Ryan (’89 O’Neill)
Unused subs: Pardington, Kearns, Maguire
Cliftonville: Gartside, Addis, Gallagher, Parkhouse (’81 C Curran), McDonagh, Lowe, Doherty, Casey (63 Gormley), Hale, Coates (’81 Turner), Moore (’29 Traynor)
Unused subs: Doherty, Ryan Curran, Robinson
Referee: Raymond Crangle