National Sickness Fund) is an Israeli health insurance and medical services organization, founded in 1933 by the Revisionist Zionist Movement.

As of 2020 it is the smallest of the four Kupot Holim (Israel's state-mandated health funds), and has over 700,000 members.

Kupat Holim Leumit was established in 1933 by physicians who had been dismissed from their work in the General Health Fund (Clalit) following Arlosoroff's murder.

In 1940 the poet Uri Zvi Greenberg wrote that the fund's function was "to educate and cure."

The uniqueness of the Leumit Health Fund lay in offering members the right to select the physician and medical service of their choice.