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