Forel was a crewed underwater submersible built in 1978 by Jacques Piccard.

Built at the Giovanola fabrication plant in Monthey and launched in Ouchy (Lausanne), it was one of the four submarines that have explored the depths of Lake Geneva, along with the Auguste Piccard and the two Mirs.

It is named after the Swiss Limnologist FA Forel.

It also visited the Strait of Messina where it reached a depth of 560 metres.

Although most of the missions were scientific, the submersible was also used for legal inquiries, industrial observations and tourism.