L. formosa may refer to:

Lambertia formosa, a shrub endemic to New South Wales Leptoxis formosa, an extinct snail Leycesteria formosa, a deciduous shrub Libertia formosa, a synonym of Libertia chilensis, an ornamental plant Lodderena formosa, a sea snail Lorryia formosa, an acariform mite

See also Lithodes formosae, a king crab