Nicolai Halby Wammen (born 7 February 1971) is a Danish politician of the Social Democrats who has been serving as Minister for Finance in the government of Prime Minister Mette Frederiksen since 2019.
A native and lifelong resident of Denmark's second-largest city, Aarhus, he served as mayor.
On the national level, he has served as Minister of European Affairs (2011-2013) and as Minister of Defence (2013-2015).