This is the list of United Kingdom MPs by seniority, 2017–2019. The Members of Parliament (MPs) are ranked by the beginning of their terms in office, in the House of Commons. The House of Commons of the 57th Parliament of the United Kingdom was elected on 8 June 2017, first met on 13 June 2017 and dissolved on 6 November 2019. The constituencies and party affiliations listed reflect those during the 57th Parliament. Seats and party affiliations for other Parliaments will be different for certain members.