September 27 is the 270th day of the year (271st in leap years), with 95 days remaining.
- 1940 — Lawrence Bittaker is born.
- 1960 — Ronald Allridge is born.
- 1974 — Arthur Leigh Allen (Suspect) is apprehended for the second time.
- 1979 — Takeshige Hamada is apprehended.
- 1986 — Michael Ihde is apprehended.
- 2000 — Rickey McGinn died.
- 2006 — Vladimir Romanov is apprehended.
- 2008 — Zhang Youtian died.
- 2012 — Sachiko Eto died.
- 2017 — German Christan is apprehended.
- 2023 — Juan Carlos Villa is apprehended.