Nikolaus Pevsner and Bridget Cherry describe it as a "church of uncommon charm... [whose] interior is well preserved in its pre-Victorian state".

[1] The church, which is Grade II* listed,[2] includes Georgian box pews, a two-decker pulpit made in 1796,[1] and a relief of the royal arms of the House of Hanover, installed in 1810.

[3] Its classical organ was installed at the south end in late 2009 by the Swiss builders Manufacture d'Orgues St Martin of Neuchâtel, and a separate parish room was added in 2018.

[5] Elizabeth Murray, Countess of Dysart, who lived at Ham House, married her second husband, John Maitland, 1st Duke of Lauderdale, in 1672.

[7] Claude Bowes-Lyon, Lord Glamis and Cecilia Cavendish-Bentinck, who lived at Forbes House on Ham Common, married at the church in 1881.

[5] There is a plaque to Sir Thomas Jenner (1637–1707), barrister, Baron of the Exchequer, and Justice of the Common Pleas, on the chancel wall.

[5] There is a plaque inside St Peter's to Elizabeth Maitland, Duchess of Lauderdale (1626–1698), who became Countess of Dysart on the death of her father, William Murray, the owner of Ham House.

[5] On one of the walls inside the church there is a memorial tablet, erected by the Hudson's Bay Company, to the explorer George Vancouver (1757–1798).

[17] Mary Burdekin (d. 1772), believed to be the first baker of Maids of Honour pastries, who had a shop in Hill Street, Richmond,[5] was described as a "[p]astry cook who by her diligence industry and anxyous care to please acquired many friends and much esteem".

[4] William Duckett MP (1685–1749) was a British Army officer and Whig politician who sat in the House of Commons from 1727 to 1741.

[19] The explorer Captain George Vancouver (1757–1798) wrote A Voyage Of Discovery To The North Pacific Ocean, And Round The World[20] when living in retirement in Petersham.

[22][23] Henry Lidgbird Ball (1756–1818), a Royal Navy officer best known for discovering and exploring Lord Howe Island (in the Tasman Sea between Australia and New Zealand), is buried in the family vault of his wife, Anne Georgianna Henrietta Johnston.

[24][25] A plaque commemorating Ball was added to the Johnston tomb on 20 October 2013, at a service attended by the Australian High Commissioner to the United Kingdom.

[49] Dorothy Grenfell Williams Powell (1934–1994), radio producer and broadcaster, Head of the BBC African Service 1988–94.

[52][53] Lieutenant-General Sir Arthur Thomas Sloggett (1857–1929), a doctor and British Army officer, is buried with his wife Helen.

[54] Major General Sir Humphry Thomas Tollemache, 6th Baronet (1897–1990), senior Royal Marines officer, and his wife Nora Priscilla (née Taylor).

[56] Chris Brasher (1928–2003), athlete, sports journalist, co-founder of the London Marathon, and Chairman of the Petersham Trust 1999–2003.