(ca.1871 – 27 January 1907) was a South Australian trades unionist who had a promising career in politics but died in office after one sitting.

David was the second of four children of John Jelley (ca.1847 – 6 June 1912), boring inspector, and Mrs. Elizabeth Stevenson Jelley (ca.1849 – 31 March 1929) who migrated to South Australia from Scotland around 1879, living initially in Wallaroo, then Port Adelaide, finally settling around 1884 at Stanley Street, Woodville.

David was born in America during a visit by his parents, who returned to their native Scotland shortly after.

In August 1906, as the Labor nominee, he won the Central district seat on the Legislative Council made vacant by the death of Henry William Thompson.

He had only attended the short December session of Parliament, but had shown great promise as a practical legislator.