David Symon (12 March 1859 – 21 March 1924) was a member of the Legislative Assembly of Western Australia from 1890 to 1892, representing the seat of South Fremantle.
His brother, Sir Josiah Symon, was the fourth Attorney-General for Australia.
Symon arrived in the Colony of Western Australia in 1881, settling in Fremantle.
He initially worked for Harrold Brothers, but later had his own firm, Symon, Hammond, & Hubble.
One of his partners was George Hubble, who was also a future MP.
At the 1890 general election in Western Australia, the first held for the new Legislative Assembly, Symon was elected to the seat of South Fremantle, unexpectedly defeating a former mayor of Fremantle, Daniel Congdon.
However, his time in parliament was short-lived, as in September 1892 he resigned his seat and left for England.
Symon took up residence in Chiswick, London, and had a business as a general merchant based in the City of London.