Gundelach is a surname. Notable people with the surname include:
- Finn Olav Gundelach (1925–1981), Danish diplomat and European Commissioner
- Hans-Jürgen Gundelach (born 1963), German footballer
- Herbert Gundelach (1899–1971), German World War II general
- Herlind Gundelach (born 1949), German politician
- Mark Gundelach (born 1992), Danish footballer