Inflexible

Inflexible may refer to:


 * Stiffness, the rigidity of an object, the extent to which it resists deformation in response to an applied force
 * Beardmore Inflexible, a British three-engined all-metal prototype bomber aircraft of the 1920s
 * HMS Inflexible, one of several Royal Navy ships of this name
 * Inflexible-class ship of the line built for the Royal Navy in the late 16th century
 * French submarine Inflexible (S615), a French nuclear submarine
 * LMS Jubilee Class 5727 Inflexible, a steam locomotive constructed in 1936.
 * ST Inflexible, a French tugboat