Mačiulaičiai is a village in Trakai District Municipality, in Vilnius County, Lithuania. Mačiulaičiai lies at 149 m above sea level. The nearest city is Vilnius, 38 km to the east. Among the landmarks around are Trakai Island Castle (20 km), Vilnius Cathedral (38 km) and Basilica of the Visitation of the Blessed Virgin Mary (19.4 km).