A hundred and twentynine Campylobacter jejuni strains isolated from hospitalized children with gastroenteritis were serotyped by the heat-stable antigen scheme (HS, Penner's method). Isolates belonged to two different periods. Group A contained strains isolated in 1987-1988 and group B contained strains which were isolated in 1998-2000. A variety of serotypes was found. Serotype HS:2 was predominant, followed by the HS:4 complex and HS:1,44. Many clinically important Guillain-Barré Syndrome associated serotypes--like HS:19--were identified. There were no significant differences in the distribution of serotypes between the two periods. The present report provides reference data, as this is the first C. jejuni serotyping study ever made in Greece.