List of hereditary peers removed under the House of Lords Act 1999

667 hereditary peers had their entitlement to sit in the House of Lords removed by the House of Lords Act 1999, based on the Orders of precedence in the United Kingdom.

Hereditary peers given life peerages
The following 10 peers were excluded from sitting in the House of Lords by virtue of their hereditary titles, and were not part of the 92 excepted hereditary peers. New life peerages were offered to hereditary peers of first creation (The Earl of Longford as Lord Pakenham (who was also a former Leader of the House of Lords), The Earl of Snowdon, The Lord Aldington and The Lord Erroll of Hale) and to previous Leaders of the House of Lords (The Lord Carrington 1963–1964, The Earl of Longford 1964–1968, The Earl Jellicoe 1970–1973, The Lord Windlesham 1973–1974, The Lord Shepherd 1974–1976, The Lord Belstead 1988–1990 and The Viscount Cranborne 1994–1997) to allow their continued membership after the passage of the House of Lords Act 1999.

Prior to the act Quintin Hogg (who was a former Leader of the House 1960–1963 as The Viscount Hailsham) had disclaimed his hereditary peerage in 1963, but had returned to the House as a life peer when he became the Lord High Chancellor of Great Britain in 1970. Also two hereditary peers had been created life peers prior to their successions to their hereditary peerages. They continued to sit in the House by virtue of their life peerages following the exclusion of hereditary peers.

Lord Great Chamberlain
Upon the passing of the House of Lords Act 1999, the following peer was an ex officio member of the House of Lords by virtue of his office as Lord Great Chamberlain. Upon the death of Queen Elizabeth II on 8 September 2022, the office changed hands and the peer was excluding pursuant to the Act.

Earl Marshal
Upon the passing of the House of Lords Act 1999, the following peer was an ex officio member of the House of Lords by virtue of his office as Earl Marshal. Prior to becoming an ex officio member, Miles Fitzalan-Howard first became Lord Beaumont after the death his mother in 1971 and also Lord Howard of Glossop in 1972 after the death his father, then he came both Duke of Norfolk and Earl Marshal on 31 January 1975.

Disclaimed hereditary peers
The following 10 peers disclaimed their respective hereditary titles under the Peerage Act 1963 which meant Peers can disclaim their respective peerage for life, even though they were not affected by the expulsion, three members returned to the House by virtue of their life peerages and remained members until their respective deaths and retirement. Despite the House of Lords Act 1999, the Barony of Silkin was disclaimed in 2002.

Irish hereditary peers
The following 68 Peers of the Peerage of Ireland were not affected by the expulsion of the House of Lords Act 1999 as they were on the Electoral roll and they were eligible to be a Member of Parliament and vote in Elections in the United Kingdom in all formats at the time, i.e. Local Government elections, European elections, Devolution elections and UK general elections.