Lely can refer to:
- Lely, Florida, USA
- Cornelis Lely, Dutch engineer and statesman, who designed and realised by law the Zuiderzee Works that made the Zuiderzee into the lake IJsselmeer
- Peter Lely, Dutch portrait painter of the 17th century
- Lelystad, town in the Netherlands, named after Cornelis Lely
- Lely High School, a high school in Naples, Florida
- Lely (company), a Dutch agricultural machine manufacturer