Melanie Arndt (born 1977) is a German environmental historian.
Arndt has a joint master's degree in political science from the University of Potsdam and in modern history and eastern European studies from the Free University of Berlin, awarded in 2004. She wrote her doctoral dissertation in history at the Humboldt University of Berlin in 2008. In 2018, she habilitated at Regensburg University.
Arndt's main focuses of work are contemporary history, environmental history and social history, historical disaster research, civil society and transnational history. Since 2018, she has been a member of the advisory board of the trade journal Zeithistorische Forschungen (Studies in Contemporal History); previously she was an editor for the magazine since 2012. Since 2020, she has been the chair for economic, social and environmental history at the University of Freiburg. In 2023, she was elected as part-time vice rector for internationalization and sustainability at Freiburg.