侵蚀轮回说也叫地理轮回说、地貌轮回说。是一种关于地貌演化过程的学说。1889年由美国地理学家威廉·莫里斯·戴维斯最先提出。这种理论认为地貌是构造、营力和时间（侵蚀阶段）的函数。例如，构造运动使地壳上升为山地，山地在流水不断侵蚀下，要经历以河流下蚀作用为主的幼年期，以侧蚀作用为主的壮年期和侵蚀微弱地面降低为缓坡的老年期，到最后地面被夷平为准平原。然后地壳再次上升，进入下一个轮回。这就是河流侵蚀轮回。此外根据营力不同还有风蚀轮回、冰蚀轮回和海蚀轮回等。每一轮回都可分为幼年、壮年、老年不同阶段，各演化阶段具有不同地貌特征。该理论曾经是地貌学的一项重要的基本理论，影响长达数年，对20世纪初期地貌学的发展有很大的推动作用。

The cycle of erosion was a model for stream erosion and landscape development proposed by William Morris Davis in the late 19th century. Davis' Stages in the fluvial cycle of erosion published in 1909 defined a young, mature, and old sequence in the development of river valleys and the landscape the rivers were eroding. His basic concept includes a rapid tectonic uplift, followed by cessation of the land, which allows the rivers and streams to reduce the surface to a level close to sea-level. The concept of peneplanation was a part of his model. In his model Davies picked up ideas of John Wesley Powell about limitation of erosion on land and concluded that sea level is the ultimate base level for subaerial erosion. Further he suggested that streams always have at least some gradient and temporary base levels, such as inland-lakes, are controlling points upstream of them. It has three stages of its model, i.e., he stated that the whole geomorphic process takes three stages as young, mature and old stages. Davis stated that the cycle begins with the uplift of mountains. Rivers and streams begin to create v-shaped valleys in their younger stage and during the first stages. At this point the relief is steepest and most irregular in nature. Next, in mature stages the streams are able to carve wider valleys and then begin to meander, leaving only gently rolling hills in old age.