Janet Wanja (24 February 1984 – 26 December 2024) was a Kenyan volleyball player, who competed for her Country at the 2004 Summer Olympics in Athens, Greece, wearing the number #7 jersey.

In 2007, under their then coach Sammy Kirongo, she led Kenya's national side to its seventh victory at the Women's African Volleyball Championship in the final against Algeria.

Dorcas Ndasaba was judged "best player" after she gained the final point to deliver Kenya's victory in straight sets.

[3] However, the KVF were not pleased and when the teams were announced for the 2016 Summer Olympics neither Brackcides Agala nor Janet Wanja were asked to the qualifying matches.

[3] In 2017 Wanja was in the Kenya Pipeline team in Cairo as they contested the Women's Africa Club Volleyball Championship.