Višnjan (Italian: Visignano) is a village and municipality in Istria, Croatia. Višnjan is the site of Višnjan Observatory (an astronomical observatory). The observatory is home of several long-running international summer programs for youth in astronomy, archeology, marine biology and other disciplines.
Višnjan is located 12 kilometers east of Poreč and 3 kilometers west of Pula-Koper road. Višnjan is located on elevation of 244m and average municipality elevation is between 200-300m. One of the most notable sinkholes in Istria, Baredina, is located in the municipality.
According to the 2001 census Višnjan had a population of 625 with a total municipal population of 2187 of which 71.7% were Croats, 9.1% were Italians and 6.2% declared themselves as Istrians. Like most settlements in Istrian interior Višnjan is experiencing depopulation in the last decades as people are migrating towards the coast.