In Transportation
- British Rail Class 166
- The now-defunct elevated IRT Third Avenue Line, 166th Street station in the Bronx, New York
- London Buses route 166
- Piaggio P.166 is a twin-engined push prop-driven utility aircraft developed by the Italian aircraft manufacturer Piaggio
- Banat Air Flight 166 crashed on take-off en route from Romania on December 13, 1995
- Alfa Romeo 166 and 166 2.4 JTD produced from 1998–2007
- Ferrari 166 model cars produced from 1948–1953
- Ferrari 166 Inter (1949) Coachbuilt street coupe and cabriolet
- Ferrari 166 F (1948) Formula 2 racer
- Ferrari 166 MM Touring (1948) Superleggera racing barchetta and coupe
- Ferrari 166 MM Zagato (1949) racing barchetta and coupe
- Ferrari 166 S Allemano (1953) racing barchetta and coupe
- Ferrari 166 SC (1948) motorcycle-fender Corsa racing roadster
- Ferrari-Abarth 166 MM/53 (1953) racing barchetta and coupe
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