Tynningö is an island in the central area of Sweden's Stockholm Archipelago.

From an administrative perspective, it is located in Vaxholm Municipality and Stockholm County.

[1][3] Tynningö is linked to the city of Stockholm and the town of Vaxholm by passenger ferries of the Waxholmbolaget, which serve a number of jetties on the island, including Höganäs, Norra Tynningö, Orrlunda and Norehill.

It is also linked to Norra Lagnö on the island of Värmdö by the Tynningöleden [sv] vehicle ferry route, operated by Trafikverket, which gives road access via the Skurubron [sv] bridge to the mainland.

Storstockholms Lokaltrafik operates bus route 689 that provides service on the island and links to the Tynningöleden and the Waxholmbolaget ships at Höganäs and Norra Tynningö.