Eldgarnsö Nature Reserve () is a nature reserve in Stockholm County in Sweden.
Eldgarnsö Nature Reserve consists of Eldgarnsö island in Lake Mälaren. A trail runs around the island. The nature reserve consists of on the one hand an area of broad-leaf forest, and on the other of an area which is more mixed, containing arable land, coniferous forest and beach meadows with shallow water overgrown with reeds.
Flora The broad-leaf forest is dominated by oak, European ash and wych elm. Mistletoe grows among the trees; this parasite is uncommon in Sweden (and hence a protected species) due to the cool climate, but survives in local areas of warmer micro-climate such as Eldgarnsö island. In the open meadows, solitary oak trees rise above stands of unspotted lungwort, Cardamine bulbifera, spring vetchling and black pea.
Fauna The island has a rich bird-life. Species include the European honey buzzard, Eurasian wryneck and ortolan bunting. The nature reserve also supports a rich variety of insects.
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