Aged 16, Alphonsine Agahozo was the youngest person to compete for Rwanda in London and debuted at the Summer Games. She qualified for the Games via a universality place by swimming's world governing body FINA because her fastest time of 5.65 seconds slower than the "B" qualifying standard for the women's 50 metre freestyle. In an interview with "Reuters" before the Games Agahozo said that she was competing against the world but noted that she had experience in other events and felt she would be "ok". She took part in the third heat of event on 3 August, finishing third out of eight competitors, with a time of 30.72 seconds. Overall Agahozo finished 58th out of 73 swimmers, and was 5.44 seconds slower than the slowest competitor who progressed to the later stages and did not advance to the semi-finals.