Air corrected 3He/4He ratios of fluid samples collected in and around Teide volcano, Tenerife, Canary Islands, ranged from 5.97 to 8.06 Ra. Helium-3 emission spatial distribution has a quite different pattern from other stratovolcanoes which show commonly a decreased trend for the 3He/4He ratio with respect to distance from the summit crater. This finding might be related to the volcano-tectonic setting differences between subduction-type and oceanic island-type statro-volcanoes. Radiogenic helium production is a significant process for the dilution of uprising derived-mantle fluids in and around subduction-type stratovolcanoes while it can be almost negligible for polygenetic volcanoes at oceanic islands. ¿ American Geophysical Union 1996