Mai Thi Nguyen-Kim is a German chemist, science communicator, television presenter and YouTuber.

Nguyen-Kim started the YouTube channel The Secret Life Of Scientists in 2015. She began another channel, maiLab, in 2016, which is currently active and funded by German public broadcasters ARD and ZDF. It has nearly 900,000 subscribers as of April 2020. Her videos explaining various everyday topics in a scientific and specifically, chemical way in a simple and understandable form, made it into German YouTube trends many times and reached several million viewers within a short time.

On German television, Nguyen-Kim presents the science show Quarks (WDR Fernsehen) since 2018, alongside Ralph Caspers. With Harald Lesch and Philip Häusser she presents the online video series Terra X Lesch & Co.

Her book Komisch, alles chemisch (in English: Weird, all chemical) published in March 2019 has been on the "Spiegel" bestseller list since November 2019.