Hornsey is a surname. Notable people with the surname include:

• Kate Hornsey (born 1981), Australian rower
• Tom Hornsey (born 1989), Australian-born American football punter

• Japanese Governmental Railways
• Japanese government-issued currency in the Netherlands Indies
• Japanese gravure idols
• Japanese green pheasant
• Japanese gregory
• Japanese Group
• Japanese gunboat Katsura Maru Number Two
• Japanese gunboat Okitsu
• Japanese hackberry
• Japanese handicrafts
• Japanese Heavy Cruiser Chikuma
• Japanese heavy metal music
• Japanese helicopter carrier Kaga
• Japanese hemlock caterpillar
• Japanese historiography
• Japanese homophones
• Japanese honors system
• Japanese honours system
• Japanese hornbeam
• Japanese House of Councillors election, 1947
• Japanese House of Councillors election, 1950
• Japanese House of Councillors election, 1953
• Japanese House of Councillors election, 1956
• Japanese House of Councillors election, 1959
• Japanese House of Councillors election, 1962