Beaconsfield (/ˈbɛkənzfiːld/) is a constituency[n 1] in Buckinghamshire represented in the House of Commons of the UK Parliament since 2019 by Joy Morrissey of the Conservative Party.

In the 1982 Beaconsfield by-election caused by the death of Sir Ronald Bell, the third-placed candidate was Tony Blair for the Labour Party.

Conservative Tim Smith was the first and only person ever to have beaten Blair in an election and won; Liberal Paul Tyler was in second place.

Tyler later became an MP for North Cornwall, meaning that, most unusually, the three main-party candidates subsequently served in the House of Commons at the same time.

Accordingly, the current contents of the constituency became: The seat then consisted of Beaconsfield, most of Burnham (including Burnham Beeches forest), Denham, Dorney, Farnham Common, Farnham Royal, Fulmer, Hedgerley, Iver, Stoke Poges, Taplow and Wexham (excluding Wexham Court);[n 2] Hedsor, Little Marlow, Marlow, Wooburn and Bourne End and the Flackwell Heath settlement of Chepping Wycombe.