Sussex was a constituency of the House of Commons of the Parliament of England then of the Parliament of Great Britain from 1707 to 1800 and of the Parliament of the United Kingdom from 1801 to 1832. It was represented by two Knights of the Shire, elected by the bloc vote system.

Under the Reform Act 1832 the constituency was split into two two-member divisions, for Parliamentary purposes, at the 1832 general election. The county was then represented by the East Sussex and West Sussex divisions.

The constituency comprised the whole historic county of Sussex. (Although Sussex contained nine boroughs - Arundel, Bramber, Chichester, East Grinstead, Horsham, Lewes, Midhurst, New Shoreham and Steyning - and four Cinque Ports - Hastings, Rye, Seaford and Winchelsea - each of which elected two MPs in their own right, these were not excluded from the county constituency, and owning property within the boroughs or ports could confer a vote at the county election.)

Two Members

• 1334: Roger Hussey;
• 1344: Roger Hussey;
• 1351: Andrew Peverell;
• 1353: Andrew Peverell;
• 1356: Andrew Peverell;
• 1361: Andrew Peverell;
• 1366: Andrew Peverell;
• 1373: Andrew Peverell;
• 1386: Sir Edmund FitzHerbert; Sir Edward Dallingridge ^[1]
• 1388 (Feb): Sir William Waleys; Sir Edward Dallingridge ^[1]
• 1388 (Sep): Nicholas Wilcombe; Robert Ore ^[1]
• 1390 (Jan): Sir William Percy; Thomas Jardyn ^[1]
• 1390 (Nov): Sir William Percy; Sir William Waleys ^[1]
• 1391: Sir William Percy; Robert Tauk ^[1]
• 1393: Sir William Percy; John Broke ^{[1] [1]}
• 1394: Sir William Percy; Sir Thomas Sackville II ^[1]
• 1395: Hugh Quecche; Sir Thomas Sackville ^[1]
• 1397 (Jan): Sir Wikkiam Percy; John Ashburnham ^[1]
• 1397 (Sep): Sir Thomas Sackville II; John Ashburnham ^[1]
• 1399: John Pelham; John Preston ^[1]
• 1401: Sir John Pelham; Sir Henry Hussey ^[1]
• 1402: Sir John Dallingridge; Sir Henry Hussey ^[1]
• 1404 (Jan): Sir John Pelham; Robert Lewknor ^[1]
• 1404 (Oct): Sir John Dallingridge; Sir John Pelham ^[1]
• 1406: Sir John Dallingridge; Sir John Pelham ^[1]
• 1407: Sir John Dallingridge; Sir John Pelham ^[1]
• 1410:
• 1411:
• 1413 (Feb):
• 1413 (May): Richard Wayville; Richard Wakehurst
• 1414 (Apr): William Bramshott; Thomas St. Cler
• 1414 (Nov): Richard Wayville; John Babelake
• 1415: Richard Styuecle; William Weston
• 1416 (Mar): Richard Styuecle; Sir Roger Fiennes
• 1416 (Oct):
• 1417: John Halle; Richard Styuecle
• 1419: Richard Bannebury; Richard Bitterley
• 1420: William Ryman; Ralph Rademylde
• 1421 (May): William Ryman; John Halle
• 1421 (Dec): Ralph Rademylde; Richard Bitterley
• 1450: Robert Poynings;
• 1456: Nicholas Hussey;
• 1483: John Wood
• 1510-1523: No names known^[2]
• 1529: Sir John Gage; Sir Richard Shirley ^[2]
• 1536:
• 1539: Sir John Gage; Sir William Goring ^[2]
• 1542: ?Sir John Gage; ? ^[2]
• 1545: ?Sir John Gage; ? ^[2]
• 1547: Sir William Goring; John Palmer ^[2]
• 1553 (Mar): ?Sir Richard Sackville; ? ^[2]
• 1553 (Oct): John Caryll; John Covert ^[2]
• 1554 (Apr): Sir Robert Oxenbridge; Sir Thomas Palmer ^[2]
• 1554 (Nov): John Covert; John Ashburnham ^[2]
• 1555: SIR Robert Oxenbridge; John Caryll ^[2]
• 1558: Sir Nicholas Pelham; Sir Robert Oxenbridge ^[2]
• 1559 (Jan): Sir Richard Sackville; John Caryll^[3]
• 1562/3: Sir Richard Sackville, died and replaced 1566 by John Apsley; William Dawtery ^[3]
• 1571: John Pelham; Thomas Palmer ^[3]
• 1572: John Jeffrey, died and replaced Jan 1581 by Walter Covert; Thomas Shirley ^[3]
• 1584: Robert Sackville; Sir Thomas Shirley ^[3]
• 1586: Walter Covert; Thomas Palmer ^[3]
• 1588 (Oct): Sir Thomas Palmer; Henry Neville ^[3]
• 1593: Robert Sackville; Sir Thomas Shirley ^[3]
• 1597 (Sep): Robert Sackville; Sir Nicholas Parker ^[3]
• 1601: Charles Howard; Robert Sackville ^[3]

The county franchise, from 1430, was held by the adult male owners of freehold land valued at 40 shillings or more. Each elector had as many votes as there were seats to be filled. Votes had to be cast by a spoken declaration, in public, at the hustings, which took place in the county town of Chichester. The expense and difficulty of voting at only one location in the county, together with the lack of a secret ballot contributed to the corruption and intimidation of electors, which was widespread in the unreformed British political system.

The expense, to candidates, of contested elections encouraged the leading families of the county to agree on the candidates to be returned unopposed whenever possible. Contested county elections were therefore unusual.

• List of former United Kingdom Parliamentary constituencies
• Unreformed House of Commons

Leigh Rayment's Historical List of MPs – Constituencies beginning with "D" (part 1)