Robert Ian Goldblatt (born 1949) is a mathematical logician who is emeritus Professor in the School of Mathematics and Statistics at Victoria University, Wellington, New Zealand.
He has also written a graduate level textbook on hyperreal numbers which is an introduction to nonstandard analysis.
In 1987 he took "a trip on Einstein's train" to develop hyperbolic orthogonality, the geometry of relativity of simultaneity.
He was elected Fellow and Councillor of the Royal Society of New Zealand, President of the New Zealand Mathematical Society, and represented New Zealand to the International Mathematical Union.
In 2012 the Royal Society of New Zealand awarded him the Jones Medal for lifetime achievement in mathematics.