Honorificabilitudinitatibus is the dative and ablative plural of the medieval Latin word honorificabilitudinitas, which can be translated as "the state of being able to achieve honours". It is mentioned by the character Costard in Act V, Scene I of William Shakespeare's Love's Labour's Lost.

As it appears only once in Shakespeare's works, it is a hapax legomenon in the Shakespeare canon. It is also the longest word in the English language featuring only alternating consonants and vowels.