Digraph may refer to:
- Digraph (orthography), a pair of characters used together to represent a single sound, such as "sh" in English
- Typographical ligature, the joining of two letters as a single glyph, such as "æ"
- Digraph (computing), a two-character sequence used in computing to enter a single conceptual character
- Digraph or directed graph, in graph theory
- Digraph, component of a CIA cryptonym, a covert code name