S. laevis

S. laevis may refer to:
 * Scleria laevis, the smooth scleria, a flowering plant species in the genus Scleria
 * Serrata laevis, a sea snail species
 * Shorea laevis, a plant species found in Indonesia, Malaysia, Myanmar and Thailand
 * Sporolactobacillus laevis, an anaerobic Gram-positive bacterium species in the genus Sporolactobacillus
 * Stokesia laevis, a flowering plant species native to southeastern North America
 * Symphonia laevis, a tropical woody plant species in the genus Symphonia
 * Symplecta laevis, a crane fly species in the genus Symplecta