Ibaraki or Ibaragi (Japanese: 茨木) is a Japanese surname. Notable people with the surname include:

• Mitsuba Ibaraki (born 1988), Japanese footballer
• Noriko Ibaragi (Japanese: 茨木 のり子, 1926–2006), Japanese writer
• Stephen Ibaraki, Canadian information technology professional
• Toshihide Ibaraki (Japanese: 茨木 俊秀, born 1940), Japanese computer scientist

• Ibaraki Prefecture
• Ibaraki (disambiguation)