The shortlist was drawn up following interviews by a selection panel at Conservative party headquarters.
The successful Tory candidate is due to be announced on 19 July after a series of hustings and a ballot of party members.
Ms Hall was until last month leader of the Conservative group on the London Assembly where she has demonstrated a combative style in scrutinising and criticising the current Labour mayor.The former Harrow councillor has vowed to restore confidence in the police on issues like burglary, theft and women's safety.
Finding better ways to use technology to improve the capital's public services is at the heart of his bid.
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