Sebastián Jahnsen Madico (born 8 September 1990) is a Peruvian swimmer.
He was born in Lima.
[1] He competed at the 2012 Summer Olympics in the men's 200 metre freestyle, finishing 34th fastest in the heats, failing to qualify for the semifinals.
[2] He also competed in the 50 metre and 100 metre events at the 2013 World Aquatics Championships.
This biographical article related to a Peruvian swimmer is a stub.