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Prime Minister Viktor Orban's Fidesz seeks a third consecutive term in parliamentary elections, campaigning with a fierce anti-immigrant message.
The poll published by website 24.hu, Republikon also showed that nationalist opposition party Jobbik gained one percentage point to 12 percent.
Another poll by Zavech Research also showed a slight drop in Fidesz support in February, while two other polls by pro-government think tanks Nezopont and Szazadveg showed unchanged voter support for Fidesz in February.
Orban's Fidesz suffered an unexpected setback at a local government by-election on Sunday when an opposition-backed independent comfortably beat the Fidesz candidate for mayor.