Geert Jan van Oldenborgh (22 October 1961 – 12 October 2021) was a Dutch climatologist and physicist. Through his career he studied climate modelling of adverse weather events and was known as a pioneer of attribution science, driving public awareness of how climate change is linked to extreme weather events. He was also the creator of a digital platform, Climate Explorer, an online meteorological data repository and platform for climate data analysis. He was a recipient of the Order of the Netherlands Lion in 2021. He was also named by Time as one of the 100 most influential people of 2021.