The event was hosted by Caroline Flack and featured performances from Janet Devlin and Diva Fever, with introductions from Peter Dickson.
Flack said: "It was a privilege to host this year's X Factor ChildLine Ball and it was really heart-warming to see such a wealth of support for this fantastic cause.
"The money raised will go towards helping some of the UK's most vulnerable children, many of whom have nowhere else to turn, so I'm delighted to have been involved."
Guests at the event included 'So Macho' singer Sinitta and ChildLine founder Esther Rantzen.
"Even after 25 years, recent headlines prove there is just as much need for ChildLine's crucial service as ever," said Rantzen.
"We know we are saving lives and protecting children from pain every day, but we could not answer a single child without the support we receive from fabulous events like The X Factor ChildLine Ball."
"Not only did our guests enjoy a wonderful evening of entertainment, but they were incredibly generous."
She added: "Thanks to them, we were able to raise over £500,000 which will enable us to transform the lives of hundreds of desperate children.
"We would especially like to thank Caroline Flack, Janet Devlin and Diva Fever who brought the glamour of The X Factor into our ballroom, and we are enormously grateful to the dedicated committee for making the evening such a resounding success."
Children and young people can contact ChildLine 24 hours a day, 7 days a week on 0800 1111 and via the ChildLine website.