Es (С, с) is the nineteenth letter of the Cyrillic alphabet. It looks like a C in the Latin alphabet. It is one of seven letters in the Cyrillic alphabet that looks like a letter in the Latin alphabet but isn't pronounced the same way. It represents except when followed by a palatalizing vowel, such as in сера (Russian for "sulfur").

It is a variant of the letter sigma, lunate sigma, in use in the Greek-speaking world in early medieval times, and has no connection to the C of the Latin alphabet, which is a descendant of gamma.

С | С (Cirillico) | С | С | Es (Cirílico) | С (кириллица) | С (ћириличко) | С | С