Blair Valk (born 1 September 1962; age 62), also known by her other stage name Borovnisa Blervaque, is an actress and model, who played a Risian woman in the Star Trek: Deep Space Nine fifth season episode "Let He Who Is Without Sin...".
Valk has also guest-starred in J. Michael Straczynski's Babylon 5 (starring Claudia Christian, Bill Mumy, Andreas Katsulas, with Carel Struycken, Keith Szarabajka, and Jane Carr), Tracey Takes On... (with fellow Deep Space Nine guest star Neil C. Vipond), and Air America (with Nicholas Guest).
Her motion picture credits include Huntress: Spirit of the Night (with Charles Cooper), Dead Weekend (1995, with Barbara Alyn Woods), and Stuart Baird's Executive Decision (1996, with Paul Collins, Dey Young, Brad Blaisdell, Ken Jenkins, Richard Riehle, and Tim Kelleher) and Warrior.