- Source: John Ahern
- Keuskupan Cloyne
- Never Grow Old (film)
- Bertie Ahern
- P.S. I Love You
- P.S. I Love You (film)
- John Bruton
- BugGuide
- Model kereta api
- Institut Teknologi Dublin
- Jeffrey Dean Morgan
- John Ahern
- Mike Ahern (Australian politician)
- Bertie Ahern
- Ahern
- John Ahern (footballer)
- John Ahern (bishop)
- John Ahern (politician)
- John H. Ahern
- Jerry Ahern
- Pendon Museum
John Ahern may refer to:
John Ahern (footballer) (born 1970), Australian rules footballer
John Ahern (politician) (1934–2020), American politician
John E. Ahern (1897–1969), Canadian politician
John Ahern (bishop) (1911–1997), Irish Roman Catholic bishop
John H. Ahern (1903–1961), British railway modeller and photographer