S. laevis may refer to: * , 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 * , an anaerobic Gram-positive bacterium species in the genus Sporolactobacillus * Stokesia laevis, a flowering plant species native to southeastern North America * , a tropical woody plant species in the genus Symphonia * , a crane fly species in the genus Symplecta