Sir John Bayley Darvall KCMG, QC (19 November 1809 – 28 December 1883)[1][2] was an Australian barrister and politician.

He was an awardee as a trustee to secure an annuity for his step-grandmother, Mary Johnson, of a compensation claim made for 264 slaves totalling £3,461.

Darvall accrued significant agricultural and pastoral interests and was a director of several colonial companies, a number of which failed in the depression of the early 1840s.

Darvall became concerned by the effects of manhood suffrage and the colony's liberal land distribution schemes and resigned from the Assembly in November 1857.

He resigned from the Council in June 1863 to successfully contest a by-election for the seat of East Maitland and on re-entering the assembly he almost immediately accepted the position of Attorney-General in the liberal government of Charles Cowper.