Vytautas Straižys (born August 20, 1936) is a Lithuanian astronomer.
In 1963–65 he and his collaborators created and developed the Vilnius photometric system, a seven-color intermediate band system, optimized for photometric stellar classification.
In 1996 he was elected a Corresponding Member of the Lithuanian Academy of Sciences.
Straižys is an editor of the journal Baltic Astronomy.
He is currently working at the Moletai Astronomical Observatory.
Asteroid 68730 Straizys in 2002 was named after him.