All of the constellations that we can see are actually in our own galaxy, so we can't really answer your question as it was asked.
The closet star to earth other than our own sun is the star Proxima Centauri, we can tell by the name that it is in the constellation Centaurus.
A constellation
he is a constellation. Not a star!!!!
Galaxy, Star System?
The nearest star to constellation Taurus is Gliese 176.
If by star system you mean more than one star but not a galaxy then Alpha Centauri is the closest star system
LHS 3003 is the closest star to earth from constellation hydra.( 20.67 light years away )
The constellation is called Bootes.The constellation is called Bootes.The constellation is called Bootes.The constellation is called Bootes.
No galaxy is 2.9 million miles away - they are much, much farther. Even the closest star in our own galaxy is much farther away than that.
Wolf 359 is the closest star to the constellation Leo. It is an extremely red dwarf.
Pollux is not a galaxy, but a star. Together with its heavenly twin, Castor, it is found in the constellation of Gemini.
Centaurus
LHS 3003