Frank den Os (1965, NL) is a visual artist working primarily with painting and collage. He lives and works in Crozon-sur-Vauvre, rural France.

His practice centres on returning to materials and discovering what can happen through working with them. Painted fragments, layers and marks are brought together, covered and reconsidered. Forms and relationships emerge through this process, often becoming apparent only after they have taken shape.

Since 2024, much of his practice has unfolded within A Measure of Days, an ongoing artwork encompassing daily collages, paintings and installations. Each work has its own presence while remaining part of a larger whole that continues to change.