Celina Johanna Maria Lemmen (born March 2, 1985) is a Dutch swimmer who specialized in freestyle events.

Lemmen grew up in San Antonio, Texas, where she attended Ronald Reagan High School and competed for their swim team.

[2] She then attended Southern Methodist University in Dallas, Texas, where she majored in management, and swam for the SMU Mustangs under head coach Steve Collins.

[4][5] Three years later, at the 2004 Summer Olympics in Athens, Lemmen qualified only for the women's 4×200 m freestyle relay as a member of the Dutch team.

[7][8] Teaming with Marleen Veldhuis, Chantal Groot, and Haike van Stralen in heat two, Lemmen swam a lead-off leg and recorded a split of 2:02.21.