Jeremy Corbyn, the MP for Islington North since 1983.
66 years old.
According to the latest polls, Corbyn has become the most popular candidate running for the Labour leadership.
Corbyn strongly opposes the rise in university tuition fees and has improving the National Health Service as a priority.
Yvette Cooper, MP for Normanton, Pontefract and Castleford since 2010, previously MP for Pontefract and Castleford since 1997.
46 years old.
Shadow Home Secretary, also a former Chief Secretary to the Treasury.
Cooper wants more support for communities to stop radicalisation and insists on an increase on building more houses.
Liz Kendall, MP for Leicester West since 2010 and Shadow health minister.
44 years old.
Kendall is believed to be a supporter of former prime minister, Tony Blair.
For Kendall, children in early school years are a priority and not cutting university tuition fees.
Andy Burnham, MP for Leigh since 2001.
45 years old.
Under Gordon Brown, he was the Secretary of State for Health and formerly served as the Culture Secretary and Chief Secretary to the Treasury.
Burnham claimed he would put ‘passengers before profit’ as his manifesto highlights nationalising the railways.