S. dubia

S. dubia may refer to:
 * Sepia dubia, a cuttlefish species native to the southeastern Atlantic Ocean
 * Schoeniparus dubia, the rusty-capped fulvetta, a bird species found in Bhutan, China, India, Laos, Myanmar and Vietnam
 * Sphyraena dubia, the Guachanche barracuda, an ocean-going fish species
 * Staehelina dubia, a plant species in the genus Staehelina