Inverse or invert may refer to:

• Inverse (logic), a type of immediate inference from a conditional sentence
• Inverse multiplexer (or 'demultiplexer'), which breaks a single data stream into several streams with lower data rates
• "Invert", a term used in the exotic pet industry to refer to arthropods
• Inversions (novel), a science fiction novel by Iain M. Banks

Inverted question (¿) and exclamation (¡) marks are punctuation marks used to begin interrogative and exclamatory sentences (or clauses), respectively, in written Spanish and sometimes also in languages which have cultural ties with Spanish, such as in older standards of Galician (now it is optional and not recommended), Catalan or Waray-Waray. They can also be combined in several ways to express the combination of a question and surprise or disbelief. The initial marks are normally mirrored at the end of the sentence or clause by the common marks (?, !) used in most other languages. Unlike the ending marks, which are printed along the baseline of a sentence, the inverted marks (¿ and ¡) actually descend below the line.