Gelder may refer to:
- In the family name Van Gelder, Gelder refers to Geldern, a town in Germany; other variants of the name are Gelderen and Gelre
- The names Gelder and Gelre also refer to the duchy of Guelders, which took its name from the town of Geldern
- Gelder, a person who performs animal castration
- People
- Aert de Gelder, Dutch painter
- Ian Gelder, English actor
- Sir (William) Albert Gelder, architect and politician of Kingston upon Hull
- Tina Gelder, British journalist
- see also Van Gelder, person with the surname "Van Gelder"
- Other
- Geldern, a city in the northwest of the federal state North Rhine-Westphalia, Germany
- Guelders, a historical county, later duchy of the Holy Roman Empire, located in the Low Countries
- Gelders Veenendaalse Voetbal Vereniging (GVVV), Dutch football club