Calamaria alcalai, also known commonly as Alcala's reed snake, is a species of snake in the subfamily Calamariinae of the family, Colubridae. The species is endemic to the island of Mindoro in the Philippines.
The specific name, alcalai, is in honor of Filipino herpetologist Angel C. Alcala.
Dorsally, Calamaria alcalai is maroon. Ventrally, it is yellow to cream-colored. The dorsal scales are arranged in 13 rows throughout the length of the body.
The preferred natural habitat of Calamaria alcalai is forest.
Calamaria alcalai is terrestrial and fossorial.
Calamaria alcalai preys exclusively upon worms.
The mode of reproduction of Calamaria alcalai is unknown.