Larissa Martins de Oliveira (born 16 February 1993) is a Brazilian freestyle swimmer.
At the 2012 FINA World Swimming Championships (25 m) in Istanbul, she finished 6th in the 4×100-metre freestyle final, 10th in the 4×100-metre medley, 12th in the 100-metre freestyle semifinal, and 38th in the 200-metre freestyle. Oliveira broke the South American record in the 4×100-metre medley, with a time of 3:57.66, along with Fabíola Molina, Daynara de Paula and Beatriz Travalon.
She classified to swim at three proofs in the 2013 World Aquatics Championships in Barcelona. In the 4×100-metre freestyle, she broke the South American record, with a time of 3:41.05, along with Daynara de Paula, Graciele Herrmann and Alessandra Marchioro. The Brazilian team finished in 11th place, and did not advance to the final. She also finished 10th in the 4×200-metre freestyle, along with Jéssica Cavalheiro, Carolina Bilich and Manuella Lyrio, and 12th in the 4×100-metre medley, along with Etiene Medeiros, Beatriz Travalon and Daynara de Paula.