Sesqui

Sesqui, Latin for one-and-one-half times, may refer to:


 * Sodium sesquicarbonate, a double salt of sodium bicarbonate and sodium carbonate
 * Sesqui 1990, a 1990 festival in Wellington, New Zealand
 * Sesquialtera (disambiguation), several meanings
 * Sesquicentennial Exposition, a 1926 world's fair in Philadelphia, Pennsylvania, U.S.
 * Sesquilinear, a property of the dot product in complex, multi-dimensional spaces
 * Sesquiplane, a type of biplane where one wing is significantly smaller than the other