The epidemiology of rotavirus infection in Spain was investigated using information from existing surveillance systems. Peports from laboratories and data on hospital admissions were used to estimate the number of hospital admissions due to rotavirus infection. Between January 1989 and December 1995 there were 8265 reports of rotavirus identificatión in the Sistema de Información Microbiológica, a voluntary national laboratory surveillance system. Where age was reported, 89.2% were in children under 5 y old. This represents 21.8% of all pathogens identified in faecal specimens in children of this age group. Between January and December 1994 there were 5639 admissions coded as “infectious intestinal disease” and 8225 as “non‐infective gastroenteritis” in children under 5 y of age in the Conjunto Minimo Básico de Datos, an obligatory hospital admissions surveillance system which covers 83% of publis hospitals. Using regression analysis of admission data and laboratory reports it was estimated that rotavirus infection accounted for 3159 (25.3%) of the hospital admissions. We estimate that 4239 admissions attributable to rotavirus occurred in children under 5 y of age in Spain in 1994, a rate of 2.5/1000 population in this age group. These estimates are lower than those published for other countries, where the burden of disease is considered high enough to warrant a national vaccination programme. A costeffectivenness study with Spanish information is essential before embarking on a national vaccination programme. □Rotavirus, surveillance, vaccination