Two unions - including one representing editorial and commercial employees - at The Washington Star have rejected a proposed contract that would provide no wage increase in its first year, according to a union source.

It is believed that seven other unions are prepared to accept the proposal, which reportedly would provide increases of $20 a week in the second year of the contract and another $20 a week in the contract's three years.

The unions that rejected the proposal over the weekend are the Washingoton-Baltimore Newspaper Guild - which represents the editorial and commercial employees - and the union that represents the photoengravers.

Neither union leaders nor officials of the newspaper would comment on the negotiations.

When Joe L. Allbritton took full control of the Star early last year, he asked his 1,700 employees to accept 200 layoffs and a wage freeze. Only the printers union did not agree.

The printers were the only union employees with a contract then in effect and they refused to forgo the raised due under that contract.

The printers are not involved in the current negotiations, and the pressmen are reported bargaining separately from the remaining nine unions.

A year ago The Star's losses were running at about $1 million a month. The losses have since been cut but are still believed to be substantial.

Because of a Federal Communications Commission regulation, Allbritton is required to sell either the Star or WMAL-TV by Jan. 30, 1979.

He has said that he intended to keep the paper if feasible, but that he could not continue to run it at a loss.