Nemesis is an inverted roller coaster located at the Alton Towers theme park in England. It opened to the public in March 1994. The 716 metre-long (2,349 ft) ride stands 13 metres (42.7 ft) tall and features a top speed of 81 km/h (50 mph). The four-inversion roller coaster was one of the first Bolliger & Mabillard rides to be installed outside of the United States and the first in Europe as an independent company.

Nemesis received a positive reception from park visitors and the attraction industry as a whole since its opening. More than 50 million people have ridden Nemesis since opening. In 'Amusement Today's' annual Golden Ticket Awards, Nemesis has consistently ranked highly. It is also one of only seven roller coasters to appear in the top 50 every year since the award's inception in 1998. It debuted at position 10 in 1998, before peaking at position 7 in 2003.

In ancient Greek religion, Nemesis is the goddess who enacts retribution against those who display arrogance before the gods. She is portrayed as a winged goddess wielding a whip or a dagger.

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