地转风（Geostrophic wind，英语发音：/dʒiːɵˈstrɒfɨk/ 或 英语发音：/dʒiːɵˈstroʊfɨk/）是一种科氏力和气压梯度力巧妙平衡下产生的一种理论上的风。这个状况称为「地转平衡」。地转风的方向和等压线平行。这种平衡在自然界中很少出现。真正的风几乎总是由地面摩擦力等其他力量产生，与地转风不同。因此，在自然中要实现地转风只有无摩擦力和等压线是完美直线的状况下。尽管如此，许多热带地区以外的大气在大部分时间仍然相当近似地转流，并且是宝贵的一次近似。水和空气中的地转流是零频率的惯性波。

The geostrophic wind (/ˌdʒiːəˈstrɒfɪk, ˌdʒiːoʊ-, -ˈstroʊ-/) is the theoretical wind that would result from an exact balance between the Coriolis effect and the pressure gradient force. This condition is called geostrophic balance. The geostrophic wind is directed parallel to isobars (lines of constant pressure at a given height). This balance seldom holds exactly in nature. The true wind almost always differs from the geostrophic wind due to other forces such as friction from the ground. Thus, the actual wind would equal the geostrophic wind only if there were no friction and the isobars were perfectly straight. Despite this, much of the atmosphere outside the tropics is close to geostrophic flow much of the time and it is a valuable first approximation. Geostrophic flow in air or water is a zero-frequency inertial wave.