Ondrej is a Slovak male given name, equivalent to Andrew. Notable people with the name include:

• Ondrej Duda (born 1994), Slovak football player
• Ondrej Otčenáš (born 1987), Slovak ice hockey player
• Ondrej Nepela (1951–1989), Slovak figure skater
  • Ondrej Nepela Arena
• Ondrej Janík (born 1990), Slovak ice hockey player
• Ondrej Zošiak (born 1990), Slovak ice hockey defenceman

• Ondřej, the Czech version of the same name, but is pronounced with a soft "ř"