Ten Conservative MPs will battle it out to be the next Tory leader and prime minister, after gaining support from fellow MPs.
The first vote will take place on Thursday, 13 June, as Tory MPs try to whittle down the list to two candidates. Members of the wider Conservative Party will then get a chance to vote for their preferred choice.
Here is a list of the candidates who made the shortlist.
Candidates had to have the backing of eight fellow MPs to make the shortlist, after the party decided to change the contest rules in order to speed up the process.
Thirteen MPs publically declared they were standing after Theresa May announced she was standing down as prime minister.
Kit Malthouse and James Cleverly later withdrew and, minutes before the Monday deadline, backbencher Sam Gyimah also pulled out.
Boris Johnson has the most backers who have made their support public. The candidates on Thursday’s ballot paper need to win at least 17 votes in the first round and 33 votes in the second to proceed further.
Of those still standing, some candidates have spent many years in senior positions, both as shadow ministers when in Opposition, or as ministers and in the Cabinet.
Candidates have been setting out their positions in a series of presentations, known as hustings, ahead of the first round of voting.
The winner is likely to be announced during the week beginning 22 July.
A fool and his, or her, money are soon parted, so the bookies are taking a look at who is out in front.
On Tuesday 18 June BBC One will be hosting a live election debate between the Conservative MPs who are still in the race.
If you would like to ask the candidates a question live on air, use the form below. It should be open to all of them, not a specific politician.
If you are reading this page on the BBC News app, you will need to visit the mobile version of the BBC website to submit your question on this topic.