Njoki Susanna Ndung'u is a Kenyan lawyer and a justice of the Supreme Court of Kenya.

Njoki, an alumna of The Kenya High School (Class of 1980/82), began her career between 1989 and 1993 at the Office of the Attorney General as a state counsel.

She served as a National Rainbow Coalition (NARC)-nominated member of Parliament between 2003 and 2007 and served on the following Parliamentary committees: She also moved several private members bills, including: She was the architect and mover of the ‘Sexual Offenses Bill, 2006’ which was eventually passed as the Sexual Offences Act 2006.

Uhuru Kenyatta was declared the president-elect of Kenya by the Independent Electoral and Boundaries Commission.

At the conclusion of the 2017 presidential election petition, Lady Justice Njoki Ndung'u rendered a dissenting opinion alongside Justice Jacktone Boma Ojwang, citing no evidence to announce the elections as null and void.