Diem

Diem may refer to:

Latin phrases

 * Carpe diem, a Latin phrase meaning "seize the day"
 * Per diem, meaning "per day"
 * De die in diem, a legal term meaning "from day to day"

Given name

 * Diem Brown (1980–2014), American television personality and journalist
 * Ngo Dinh Diem (1901–1963), Vietnamese leader assassinated in a military coup
 * Diem Saunders (1991/1992–2021), Inuk writer and activist from Canada

Surname

 * Carl Diem (1882–1962), originator of the Olympic torch relay
 * Ryan Diem (born 1979), American football player

Other uses

 * Diem (digital currency) (2019-2022), a digital currency formerly proposed by Facebook
 * DiEM25, Democracy in Europe Movement 2025
 * Diem or Didam, a town in the Netherlands