Maria van Gelre was born on an unknown date to Hendrik I van Gelre (c1117-1182) and Agnes von Arnstein (c1130-1171) . She married Gerard II van Loon (-1191) .
Children
| Name | Birth | Death | Joined with |
| Lodewijk II van Loon (?-1218) | 1218 | Ada van Holland (1188-1223) | |
| Gerard III von Rieneck (?-1216) | 1216 | Kunegonde von Zimmern (?-?) | |
| Hendrik van Loon (?-1218) | 3 August 1218 | Mechtild von Vianden (?-1241) | |
| Arnold III van Loon (?-1221) | 1221 | Adelheid van Brabant (1190-1265) | |
| Dirk van Loon (?-aft1207) | |||
| Willem van Loon (?-1206) | |||
| Imagina van Loon (?-?) | |||
| Mathilde van Loon (?-1249) | |||
| Luitgarde van Loon (?-1249) | 1249 | Adolf I. von der Mark (c1194-1249) | |
| Dochter van Loon (?-?) | |||