But Romania's leader -- President Traian Basescu -- has not said whether he will sign into law the bill that Parliament passed this week granting the big raise.
Romania -- which faces a national election next month -- has economic growth forecast at 9 percent this year. But the generally poor country also has inflation running at about 8 percent.
Prime Minister Calin Popescu Tariceanu proposed a 9 percent pay raise for teachers in September. On Wednesday, he said 50 percent isn't economically viable.
Monthly salaries for Romanian teachers currently start at 900 lei (245 euros; $350).