Uroteuthis singhalensis, commonly known as the long barrel squid, is a species of squid from the genus Uroteuthis. The species can be found in the Indo-West Pacific Ocean.

Taxonomy and history This species was first described as Loligo singhalensis by Arnold Edward Ortmann in 1891, with the description published in volume five of Zoologische Jahrbücher. The World Register of Marine Species regards Uroteuthis singhalensis as a member of the Uroteuthis subgenus Photololigo.

Description Uroteuthis singhalensis is a species of squid characterized by its long, slender body shape. The mantle (main body) is cylindrical, tapering to a sharp point at the rear, and is about 4–7 times as long as it is wide in mature individuals. The fins are relatively narrow and rhombic (diamond-shaped) in outline, extending for about half the length of the mantle in adults, though shorter in young specimens. The front edge of the fins curves slightly outward, while the rear edge curves slightly inward. The head is comparatively small and short, with medium-sized eyes. The arms are slender and fairly short compared to the body.