Katrina Law is an American actress. She is known for playing the roles of Mira on the Starz television series Spartacus: Blood and Sand and Spartacus: Vengeance, Nyssa al Ghul on The CW television series Arrow, Karen Beach on the Sony Crackle series The Oath, Quinn Liu on the CBS series Hawaii Five-0 and Jessica Knight on the CBS series NCIS.

Law was born in Philadelphia^[2] and grew up in Deptford Township, New Jersey.^[3] Her mother is Taiwanese and her father is of German and Italian descent.^[2] As a teenager, she was crowned Miss New Jersey Teen USA.^[4] She graduated from the Richard Stockton College of New Jersey with a B.A. in Performing Arts (Theatre Performance) in 1999.^[5]

Law worked alongside director Adrian Picardi with producers Eric Ro and Don Le, to create a low budget web series called The Resistance.^[6] Picardi was the series' official creator and director. The show was later picked up by Starz which led to Law's casting in Spartacus: Blood and Sand in 2009.^[7] In 2011, Law completed an action-oriented project called 3 Minutes with director Ross Ching, producers Don Le and George Wang, starring Harry Shum Jr., Stephen "tWitch" Boss (the runner up on season 4 of Fox's So You Think You Can Dance), and herself.^[4][8]

From 2014 to 2020, she had a recurring role on The CW television series Arrow as Nyssa al Ghul, the daughter of the notorious leader of the League of Assassins, Ra's al Ghul.^[9][10]

In 2019, Law was cast as co-lead in the CBS pilot Alive, as medical examiner Elizabeth Lavenza, whose husband Mark Escher (Ryan Phillipe) is brought back to life by the mysterious Dr Frankenstein (Aaron Staton).^[11] Later that year she joined the cast of CBS's Hawaii Five-0 for the series' tenth season.^[12][13] In March 2021, Law was cast in the eighteenth season of NCIS in the role of Jessica Knight.^[14] She appeared in the final two episodes of the season with the potential to become a series regular if the series is renewed for a nineteenth season;^[15] it was later confirmed that Law would become a series regular beginning with the nineteenth season.^[16] In January 2022, it was announced that Law's NCIS character would cross over to NCIS: Hawaiʻi for an episode.^[17]

Law married actor Keith Andreen in January 2013. In December 2018, she gave birth to their daughter.^[18]