Onderwierum is a hamlet in the municipality of Het Hogeland, in the province of Groningen. It is located just south of Onderdendam, of which it is a part administratively. The hamlet is built on two mounds and includes a former cemetery. The hamlet had its own church dating from the Middle Ages which was demolished in 1841.
{{Infobox settlement
| name = Onderwierum | native_name = | settlement_type = Hamlet
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).