'''Hamaguchi''' (written: {{Nihongo2|浜口}} or {{Nihongo2|濱口}}) is a Japanese surname. Notable people with the surname include:
*{{Nihongo|Hideki Hamaguchi|浜口 秀樹||born 1956}}, Japanese basketball player *{{Nihongo|Honoo Hamaguchi|浜口 炎||born 1971}}, Japanese basketball coach *{{Nihongo|Kanari Hamaguchi|濱口 華菜里||born 1985}}, Japanese volleyball player *{{Nihongo|Mark Hamaguchi|浜口マーク||born 1982}}, Japanese skate boarder, invented the bicycle trick; "Ninja brakes", a dismount technique, running out of a bicycle at its top speed *{{Nihongo|Masaru Hamaguchi|濱口 優||born 1972}}, Japanese comedian *{{Nihongo|Hamaguchi Osachi|濱口 雄幸||1870 – 1931}}, 27th Prime Minister of Japan *{{nihongo|Ryusuke Hamaguchi|濱口 竜介||born 1978}}, Japanese film director and screenwriter *{{Nihongo|Shirō Hamaguchi|浜口 史郎||born 1969}}, Japanese anime composer *{{Nihongo|Sota Hamaguchi|濱口 草太||born 1999}}, Japanese footballer *{{Nihongo|Toshiyuki Hamaguchi|浜口 俊之||born 1970}}, Japanese motorcycle racer *{{Nihongo|Yoshihiro Hamaguchi|浜口 喜博||1926–2011}}, Japanese freestyle swimmer
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Category:Japanese-language surnames