Saltholm (Salt islet) is an island in the Oresund just east of Amager, Denmark. It is a nature reserve for birds. There is a human population of three, managing the reserve farm to keep grazing levels ideal for the nesting birds. The island is very flat, with a maximum altitude of 5 m above sea level (where the farm is situated); it can be extensively flooded if persistent east winds cause a tide surge in the Baltic Sea.

Its neighbouring island is the artificial island Peberholm, which is a part of the Oresund Bridge.