Alpha Leonis is about 77 light years from Earth. You didn't specify which star, so I just picked the brightest.
It is Regulus, Alpha Leonis, whose magnitude is 1.34
Regulus, also designated Alpha Leonis, is the brightest star in the constellation Leo.
The binary star Gamma Leonis (Algieba, the forehead) is about 126 light-years from Earth.
alpha centauri
The constellation Leo is the 12th largest constellation in the sky and covers 947 square degrees. The stars in Leo include; Alpha Leonis, Beta Leonis, Gamma Leonis, Theta Leonis, Delta Leonis, Kappa Leonis, Lambda Leonis and Omicron Leonis. The brightest star is Alpha Leonis.
This is a constellation of stars. Alpha Leonis is a three star system - combining the light from all three, it is the brightest in the constellation.
The constellation of Leo contains the main sequence star, Regulus(Alpha Leonis), as well as Beta Leonis, Gamma Leonis, Delta Leonis, Zeta Leonis, Iota Leonis and Tau Leonis. Additional stars include Mu Leonis, Theta Leonis, red giant R Leonis, Wolf 359, Gliese 359, CW Leo, Caffau's Star. Leo also contains the Leo Ring, a group of large quasar groups and several galaxies including Messier 65, Messier 66, Messier 95, Messier 96, Messier 105 and NGC3628.
4.2 light years is the distance to the Alpha Centauri Star System.
Regulus (α Leo / α Leonis / Alpha Leonis) is the brightest star in the constellation Leo and one of the brightest stars in the nighttime sky.
Beta Leonis is white-dwarf star. It is also blue-white.
Acubens, Alpha Cancri A, is approximately 174 light years from Earth.