The 40-year-old MP for Wigan became the fourth Labour figure to declare she is standing for the leadership, in a letter to the Wigan Post. One of a clutch of shadow ministers who resigned from Jeremy Corbyn's frontbench after the Brexit referendum, she has been urging her party to concentrate on winning support in smaller towns.
Sir Keir Starmer
The 57-year old shadow Brexit secretary has said he is "seriously considering" running. He is likely to be seen as the centrist candidate in the race. A passionate Remainer, he was director of public prosecutions before entering Parliament.
The 40-year old shadow business secretary is another MP to announce she is considering going for the top job. One of a new generation of MPs on the left of the party who is close to Mr Corbyn's inner circle, she represented Labour in a TV debate during the election.
The 38-year-old Birmingham Yardley MP became the third Labour figure to declare she is standing for the leadership. She has been one of the most outspoken critics of Jeremy Corbyn's leadership and the party's record on tackling anti-Semitism, bullying and harassment.
The 59-year old shadow foreign secretary was the first to declare she is running to succeed Mr Corbyn. She deputised for him at Prime Minister's Questions, but was replaced after publicly calling for Labour to back another EU referendum.
The 50-year old, a former cabinet minister under Gordon Brown's premiership, said last month that she would "decide over Christmas" whether to stand, and has made no statement since then. She was an unsuccessful challenger to Jeremy Corbyn during the 2015 leadership contest.
The 48-year-old shadow Treasury minister resigned from the party's frontbench last year in order to oppose the bill triggering the Brexit process. An early supporter of Jeremy Corbyn, he rejoined in January last year".