Seefelder Straße (B 177) is a 21.2 km long former federal road or Bundesstraße - now classified as a "priority road" or Straße mit Vorrang - in the Alps in the Austrian federal state of Tyrol.

The Karwendel Railway runs more or less parallel with the Seefelder Straße, crossing it several times.

The Seefelder Straße runs through the Northern Limestone Alps, between the mountain ranges of the Karwendel (max.

The road runs in a generally northwesterly direction from the junction of Zirl-Ost (ca.

590 m (AA)) on the Inn Valley Autobahn (the A 12), initially heading east and then north past Zirl (622 m), where it runs over the south and east flanks of the Zirler Berg (1,057 m) with a maximum gradient of 16% and only one hairpin bend; there it is also known as the Zirlerbergstraße.