WARSAW, Poland (AP) _ A Polish court on Thursday convicted a prominent Solidarity leader and three associates in the outlawed free trade union of inciting public unrest, and sentenced them to up to two years in prison.

The court found Seweryn Jaworski, 54, former deputy chairman of the Warsaw region for Solidarity, guilty of issuing public appeals for a boycott of last October's Parliamentary elections. It gave him the stiffest sentence - two years in prison.

Grzegorz Myszka, 23, a Warsaw polytechnic student, and Jacek Szymaszek, 21, a trainee at the Warsaw steelworks, each drew 20-month prison terms, and Pawel Lapinski, 27, a worker, an 18-month sentence for spreading information without a permit.

Defense lawyers said the four, who insisted they are innocent, would appeal the verdicts.

Myszka, Szymaszek and Lapinski were arrested three days before the Oct. 13 election when police foiled an attempt in downtown Warsaw to broadcast a taped Solidarity appeal for an election boycott.

Until his arrest on Oct. 25, Jaworski had focused his activities around St. Stanislaw Kostka church, parish of the slain pro-Solidarity priest, the Rev. Jerzy Popielusko, sources said.

Jaworski was among 11 prominent Solidarity leaders released from a Warsaw prison under an amnesty for political prisoners in August 1984. Solidarity was crushed by Polish forces in October 1981 when matial law was declared.

Solidarity called for a voter boycott of last year's nationwide elections to protest political repressions and declining living standards.