| Winfried Nachtwei | |
| Office: | Member of the Bundestag |
| Term Start: | 1994 |
| Term End: | 2009 |
| Birth Date: | 15 April 1946 |
| Birth Place: | Wulfen, Dorsten |
| Citizenship: | German |
| Nationality: |  Germany |
| Party: | Alliance '90/The Greens |
| Alma Mater: | University of Münster |
Winfried Nachtwei (born 15 April 1946 in Wulfen) is a German politician and former member of Alliance '90/The Greens in the Bundestag. He is an expert on the Afghanistan conflict and works as a peace and conflict consultant since leaving the Bundestag. His nickname is "Winni".
Nachtwei was a member of the Communist League of West Germany (Kommunistischer Bund Westdeutschland; KBW) in the 1970s.
Nachtwei first became a member of the German Bundestag in the 1994 elections, representing the electoral district of Münster. Throughout his time in parliament, he was a member of the Defence Committee.
In addition to his committee assignments, Nachtwei served as member of the Parliamentary Friendship Group for Relations with the SADC States; the Parliamentary Friendship Group for Relations with the Baltic States; and the German-Belarusian Parliamentary Friendship Group.
Nachtwei did not run for office again in the 2009 elections.