Uniondale High School is a public high school located in Uniondale, Nassau County, New York, U.S.A., and is the only high school operated by the Uniondale Union Free School District.

As of the 2014-15 school year, the school had an enrollment of 2,220 students and 153.0 classroom teachers (on an FTE basis), for a student–teacher ratio of 14.5:1.

There were 1,187 students (53.5% of enrollment) eligible for free lunch and 251 (11.3% of students) eligible for reduced-cost lunch.

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