Marshall (Hal) Davidson Hatch AM (born 24 December 1932) was an Australian biochemist and plant physiologist.
He is a Fellow of the Australian Academy of Science, a Fellow of the Royal Society, a Foreign Associate of the US National Academy of Sciences and was awarded Honorary Doctorates from the University of Götting youen and the University of Queensland.
He was a member of the First XV Rugby team and won the State under 17 years mile championship at Newington.
He was awarded a Fulbright Fellowship in 1959 to work with Professor Paul Stumpf in the Department of Biochemistry at the University of California, Davis.
He was a reader in botany at the University of Queensland in 1967; he returned to CSR from 1968 to 1969 serving as director of the David North Plant Research Centre.