J
- Jamaica
- Japanese knotweed
- Japanese World War II prisoners
- Jersey
- Jetties
- Jewellery traders
- Jigs
- Job-related accommodation
- Jobber
- Jobmatch scheme
- Jobseeker's allowance
- Jockeys – see Sportsmen
- Joint and several liability
- Joint authority for Great Britain and Northern Ireland
- Joint income
- Joint loans
- Joint ownership
- Joint property
- Joint purchasers
- Joint settlors
- Joint tenancies
- Joint venture companies
- Joint ventures
- Jointly held assets
- Jointly held property
- Jointly owned companies
- Jointly-held assets
- Jointly-owned companies
- Jointly-owned property
- Journalists
- Journals
- Judges and recorders
- Judgment debts
- Judicial Appointments Committee
- Judicial compliance orders
- Judicial pensions
- Judicial precedent
- Judicial protection
- Judicial review
- Judicial ruling upholding asserted tax advantage
- Judicial separation
- Junior ISA
- Jurisdiction
- Jury service
- Just and reasonable apportionment
- Justices of the Peace