Marilyn Chua Yu Ching (born 25 August 1980) is a Malaysian former swimmer, who specialised in sprint freestyle events.

[1] Chua represented Malaysia, as a 20-year-old, at the 2000 Summer Olympics, and formerly held a Malaysian record in the 50 m freestyle, before it was eventually broken by Cindy Ong in 2004.

[2] Chua also attended the University of California, Los Angeles, where she majored in international development studies and swam for the UCLA Bruins, under head coach Cyndi Gallagher.

She achieved a FINA B-cut of 27.16 from the Janet Evans Invitational in Los Angeles, California.

[5][6] She challenged seven other swimmers in heat four, including Russian import Yekaterina Tochenaya of Kyrgyzstan, and Yugoslavia's two-time Olympian Duška Radan.