Sergio Álvarez Boulet (born 11 October 1979) is a Cuban weightlifter.

He represented Cuba at the 2000 Summer Olympics, ranking 5th.

[1] He participated in the men's -56 kg class at the 2006 World Weightlifting Championships and won the silver medal, finishing behind Li Zheng.

[2] He twice won the gold medal at the Pan American Games in the 56 kg category.

[3] This biographical article relating to weightlifting in Cuba is a stub.