Sir John Fellowes, 1st Baronet (baptised 1670 – 1724)[2] was an English merchant who was one of the founding directors of the South Sea Company.

[6] Coulson was buried in a vault on the north side of the chancel of St Michael Paternoster Royal, built in 1712 by William and John Fellowes.

After the accession in 1714 of George I of Great Britain, properties held by Carlton were granted to Fellowes, including a copper mill.

[13] The legal and tax position was rectified, for the properties that had come to Fellowes from Carlton, by a device suggested by Sir William Scawen.

[17] The battlements are an example of the sham medievalism of the time, seen also at Briggens House, built by Robert Chester, another South Sea Company director.

[18] At Carshalton House, Fellowes also employed the garden designer Charles Bridgeman, and the nurseryman Joseph Carpenter of Brompton Park.

[30] Sir James Bateman, a Tory ally of Robert Harley, had the "central role" of sub-governor of the company from around 1711 to his death in November 1718.

[31] Fellowes was his successor, and in February 1719 signed a proposal for the South Sea Company going forward, paying down the government debt, with Charles Joye as deputy-governor.

[32] In the South Sea Company Act 1720, Fellowes was named as "late Sub-Governor", at the head of the group singled out for "many notorious, fraudulent and indirect Practices".

[35] Fellowes and Sir William Scawen contributed, with others, to the building of the galleries in All Saints' Church, Carshalton, at the beginning of the 18th century.