John Josiah Guest

Sir John Josiah Guest Bt FRS
Member of Parliament for Merthyr Tydfil
In office 1832–1852
Preceded by	Office created
Succeeded by	Henry Bruce
Personal details
Born	Josiah John Guest (1785-02-02)2 February 1785 Dowlais, Merthyr Tydfil, Wales
Died	26 November 1852(1852-11-26) (aged 67)
Resting place	St John's Church, Dowlais
Spouse(s)	Maria Rankin Lady Charlotte Bertie
Children	Charlotte Maria Du Cane Ivor Bertie Guest, 1st Baron Wimborne Katharine Gwladys Alderson Thomas Merthyr Guest Montague John Guest Augustus Frederick Guest Arthur Edward Guest Mary Enid Evelyn, Lady Layard Constance Rhiannon Eliot Blanche Vere Ponsonby, Countess of Bessborough
Parents	Thomas Guest (father) Jemima Revel Phillips (mother)
Occupation	Businessman

Sir Josiah John Guest, 1st Baronet (2 February 1785 – 26 November 1852), known as John Josiah Guest, was a British engineer, entrepreneur and politician.