Grant Robert Sutherland AC (born 2 June 1945) is a retired Australian human geneticist and cytogeneticist.

He was the Director, Department of Cytogenetics and Molecular Genetics, Adelaide Women's and Children's Hospital for 27 years (1975-2002), then became the Foundation Research Fellow there until 2007.

These studies culminated in the recognition of fragile X syndrome as the most common familial form of intellectual impairment, allowing carriers to be identified and improving prenatal diagnosis.

[3] After graduating with his PhD, in 1975, Sutherland took up the role of Director of the Department of Cytogenetics and Molecular Genetics at the Women's and Children's Hospital (WCH) in Adelaide.

He found that the fragile X fault behaved differently to most genetic mutations; it builds up as it replicates through generations until it reaches a threshold where the full-blown syndrome is triggered.

[8] In 1998, Sutherland and Associate Professor Eric Haan discovered Sutherland–Haan Syndrome, which is another genetic disease that causes intellectual and physical problems among males.

[9] The proposal of prenatal testing to diagnose genetic diseases has sometimes been controversial for Sutherland, because it raises the question of what to do if problems are detected.

[8] In 2005, the Human Genetics Society of Australasia introduced the annual "Sutherland Lecture" in his honour, allowing outstanding mid-career researchers to showcase their work.