UJS said it had circulated a petition at the conference signed by 200 delegates objecting to a boycott of Israel.
The motion, proposed by Sheffield University and Goldsmiths College, London, called on NUS to lobby governments and universities to terminate contracts with “companies that are complicit in the occupation of the Palestinian territories”.
It also sought to encourage links with Palestinian universities, to introduce a “right to return for all refugees” and to increase sanctions against Israel.