Expressivity, expressiveness, and expressive power may refer to:

• Expressivity (genetics), variations in a phenotype among individuals carrying a particular genotype
• Expressive loan, a type of loanword in phono-semantic matching
• Expressive power (computer science) of a programming language
• Expressive suppression, an aspect of emotion regulation
• Expressive therapies, the use of creative arts as therapy
• Expressive timing, musical phenomenon
• Expressives or ideophones, linguistic word class

• Expression (disambiguation)