Nicholas Gordon Martin (born 14 February 1950) is an Australian behavior geneticist who has published over 1300 peer-reviewed articles on topics including the heritability of religion and intelligence and medical disorders such as endometriosis. Martin is among the most cited medical scientists in the Southern Hemisphere, with a number of citation classics including "Genes, culture and personality: An empirical approach" that he co-authored with Lindon Eaves and Hans Eysenck, "Analysis of the p16 gene (CDKN2) as a candidate for the chromosome 9p melanoma susceptibility locus" (Nature, and "Genetic and environmental contributions to alcohol dependence risk in a national twin sample".