A novel oat cultivar, designated ROMAR-07, is disclosed. The invention relates to the seeds of oat cultivar ROMAR-07, to the plants of oat ROMAR-07 and to methods for producing a oat plant produced by crossing the cultivar ROMAR-07 with itself or another oat variety. The invention further relates to hybrid oat seeds and plants produced by crossing the cultivar ROMAR-07 with another oat cultivar.