- Source: Sir Robert Newcomen, 6th Baronet
- Sir Robert Newcomen, 6th Baronet
- Sir Arthur Newcomen, 7th Baronet
- Newcomen baronets
- Viscount Newcomen
- Thomas Gleadowe-Newcomen, 2nd Viscount Newcomen
- Arthur Chichester, 3rd Earl of Donegall
- Arthur Chichester, 2nd Earl of Donegall
- Charlotte Gleadowe-Newcomen, 1st Viscountess Newcomen
- Gore baronets
- Robert King, 6th Earl of Kingston
Sir Robert Newcomen, 6th Baronet (1664 – 6 March 1735) was an Anglo-Irish politician.
Newcomen succeeded to his father's baronetcy in 1689. He represented County Longford in the Irish House of Commons between 1692 and his death in 1735.