No, there is no evidence or news from the band to suggest this.
No. Niall is not leaving One Direction. We know because they would mention it more in interviews and such. Also the band is fairly newer so they wouldn't do that this early. In interviews they HAVE talked about being excited about making a second album in the future. Niall is not leaving One Direction.
No
Niall is the Irish, funny, and cheeky one in one direction and the blonde one.
Niall
*Niall from One Direction is not going out with anybody right now, he is single.
Niall Horan is the 2nd youngest in One Direction.
Niall is the only one in One Direction that is left handed and the others are right handed.
Niall James Horan
No...
Niall giraffes
Niall Horan
Niall has only written songs when he was in One Direction.