Un casquete de hielo o casquete glaciar es una masa de hielo que cubre un área menor que 50.000 km² (generalmente en una zona elevada). Las masas de hielo mayores son designadas como mantos de hielo o Indlandsis. Los casquetes de hielo o casquetes glaciares no están limitados por la topografía (p.e., pueden cubrir montañas) pero su "domo" se encuentra generalmente centrado alrededor del punto más alto de un macizo. El hielo fluye a partir de este punto más elevado (la divisoria de hielo) en dirección a la periferia de la capa de hielo. Vatnajökull es un ejemplo de un casquete de hielo, en Islandia.

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An ice cap is an ice mass that covers less than 50,000 km² of land area (usually covering a highland area). Larger ice masses covering more than 50,000 km² are termed ice sheets. Ice caps are not constrained by topographical features (i.e., they will lie over the top of mountains). By contrast, ice masses of similar size that are constrained by topographical features are known as ice fields. The dome of an ice cap is usually centred on the highest point of a massif. Ice flows away from this high point (the ice divide) towards the ice cap's periphery. Ice caps have significant effects on the geomorphology of the area they occupy. Plastic moulding, gouging and other glacial erosional features become present upon the glacier's retreat. Many lakes, such as the Great Lakes in North America, as well as numerous valleys have been formed by glacial action over hundreds of thousands of years. On Earth, there are about 30 million km³ of total ice mass. The average temperature of an ice mass ranges between −20 °C and −30 °C. The core of an ice cap exhibits a constant temperature that ranges between −15 °C and −20 °C. A high-latitude region covered in ice, though strictly not an ice cap (since they exceed the maximum area specified in the definition above), are called polar ice caps; the usage of this designation is widespread in the mass media and arguably recognized by experts.Vatnajökull is an example of an ice cap in Iceland.

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