The M15 motorway () is a Hungarian motorway connects the M1 motorway to Bratislava, the capital of Slovakia. The Hungary-Slovakia border crossing is at Rajka (Hungary) and ÃÂunovo (Slovakia).
Until 2019, the M15 motorway featured grade separation akin to all motorways, but did not feature four lanes. The M15 has been widened to four lanes by December 2019, a few months ahead of schedule.