Petteri Taalas (born 3 July 1961 in Helsinki, Finland) is the Secretary-general of the World Meteorological Organization, headquartered in Geneva, Switzerland.
Appointed in 2015 by the World Meteorological Congress, the supreme body of the Organization, he took up the four-year Secretary-General term on 1 January 2016, and was re-elected to a second four year term on 13 June 2019.
He was director general of the Finnish Meteorological Institute from 2002 to 2005 and 2007 to 2015.