Vasileios is a Greek word meaning "royal", or "kingly". It may refer to:

• Agios Vasileios, Achaea, village in the municipal unit of Rio, in Achaea, Greece
• Agios Vasileios, Corinthia, village in the municipal unit of Tenea, in Corinthia, Greece

• Vasileios Christopoulos (born 1951), Greek writer
• Vasileios Demetis (born 1983), Greek swimmer
• Vasileios of Dryinoupolis (1858–1936), religious figure in the Greek Orthodox church in Northern Epirus
• Vasileios Polymeros (born 1976), Greek rower
• Vasileios Pliatsikas (born 1988), Greek footballer
• Vasileios Spanoulis (born 1982), Greek professional basketball player
• Vasileios Theodoridis, Greek journalist