A novel snap pea cultivar, designated SL3118, is disclosed. The invention relates to the seeds of pea cultivar SL3118, to the plants of pea-line SL3118 and to methods for producing a pea plant by crossing the cultivar SL3118 with itself or another pea line. The invention further relates to methods for producing a pea plant containing in its genetic material one or more transgenes and to the transgenic plants produced by that method and to methods for producing other pea lines derived from the cultivar SL3118.
