Nicolas Nilo César de Oliveira (born 4 August 1987) is a Brazilian former freestyle swimmer who specialized in sprint events.

[21] At the 2010 FINA World Swimming Championships (25 m) held in Dubai, the Brazilian national team, composed of César Cielo, Nicholas Santos, Marcelo Chierighini, and Nicolas Oliveira, won the bronze medal in the 4 × 100-metre freestyle, with a time of 3:05.74 (South American record), with Brazil beating the American team.

[32] At the 2013 World Aquatics Championships in Barcelona, he finished seventh in the 4 ×100-metre freestyle, along with Fernando Santos, Marcelo Chierighini, and Vinícius Waked.

[36] At the 2014 Pan Pacific Swimming Championships in Gold Coast, Queensland, Australia, Oliveira won a bronze medal in the Brazilian 4 × 100-metre freestyle relay, along with João de Lucca, Marcelo Chierighini, and Bruno Fratus.

[45][46] Oliveira competed for the last time at the 2016 Summer Olympics, where he went to the Men's 4 × 100 metre freestyle relay final, finishing in 5th place.

[49] At 29 years old, he said goodbye to swimming after three Olympic Games (Beijing 2008, London 2012 and Rio 2016), and six World Championships (Melbourne 2007, Rome 2009, Dubai 2010, Shanghai 2011, Barcelona 2013 and Kazan 2015).