Ariga
有賀 is a Japanese surname, read as either Ariga or Aruga. Notable people with the surname include:
- Akiko Aruga, Japanese speed skater
- Katsuhiko Ariga, Japanese chemist
- Kōsaku Aruga, or less often by the alternate reading Kosaku Ariga, captain in the Imperial Japanese Navy
- Nagao Ariga, or Nagao Aruga, Japanese jurist and historian
- Nobuo Ariga, also known as Hiroo Ariga, Japanese singer-songwriter, bassist, arranger and record producer