Harlingen may mean:

• Harlingen, Netherlands, a municipality and city in the province of Friesland in the Netherlands
• Harlingen, Texas, a city in the United States
• Harlingen, New Jersey, an unincorporated village in Montgomery Township, New Jersey, United States

• Ion Gavrilă-Ogoranu
• Ion Geophysical Corporation
• Ion-Georgi Kostev
• Ion Gh. Duca
• Iongi
• Iong Kim Fai
• Iongom language
• Ion Gorun
• Ion Grigorescu
• Ion gun
• Ion Gun
• Ion Guţu
• Ion Horatiu Crisan
• Ion Horaţiu Crişan
• Ion Horațiu Crișan
• Ion I. Agarbiceanu
• Ion I. Agârbiceanu
• Ionia in the middle ages
• Ionia, Kansas
• Ionia Maximum Correctional Facility
• Ionia, Michigan micropolitan area
• Ionia, MI Micropolitan Statistical Area
• Ionian Adriatic Pipeline
• Ionian and Popular Bank of Greece
• Ionian column