The second series of the New Zealand television reality music competition The X Factor premiered on TV3 in February 2015. Pre-auditions began in October 2014. As well as again being open to singers aged 14 and over, the second series is also open to bands. Bands must contain no more than five members and have at least two singers. The contestants were split into the show's four traditional categories: Boys, Girls, Over-25s and Groups.
The series premiered on Sunday 15 February, and screened three nights per week (Sunday–Tuesday) until March 15, when it returned to the regular schedule of two nights per week (Sunday–Monday). As well as being broadcast on TV3, the full series is also streamed live on TV3's website. The live shows are simulcast on More FM.
The series is again hosted by Dominic Bowden. Both former All Saints singer Melanie Blatt and Australian Idol winner Stan Walker returned to judge the second series. They were joined by new judges, married couple Willy Moon and Natalia Kills until the first live show, then The X Factor Australia judge Natalie Bassingthwaite and I Am Giant drummer Shelton Woolright from the second live show.
The series is accompanied by spin-off show The Xtra Factor, which is hosted by Guy Williams, Sharyn Casey and Clint Roberts, and screens on Four immediately after The X Factor.