In linguistic typology, split ergativity is a feature of certain languages where some constructions use ergative syntax and morphology, but other constructions show another pattern, usually nominative–accusative. The conditions in which ergative constructions are used vary among different languages.

Nominative–accusative languages (including Indo-European languages) treat both the actor in a clause with a transitive verb and the experiencer in a clause with an intransitive verb in the same way grammatically. If the language uses case markers, they take the same case. If it uses word order, it is parallel.

For example, consider these two English sentences:

The grammatical role of "Jane" is identical. In both cases, "Jane" is the subject.

In ergative–absolutive languages (such as Basque and Georgian, or the Eskaleut and Mayan languages), there is a different pattern. The patient (or target) of a transitive verb and the experiencer of an intransitive verb are treated the same grammatically. If the two sentences above were expressed in an ergative language, "Max" in the former and "Jane" in the latter would be parallel grammatically. Also, a different form (the ergative) would be used for "Jane" in the first sentence.

For example, in the following Inuktitut sentences, the subject 'the woman' is in ergative case (arnaup) when occurring with a transitive verb, while the object 'the apple' (aapu) is in absolutive case. In the intransitive sentence, the subject 'the woman' arnaq is in absolutive case.

In split ergative languages, some constructions pattern with nominative–accusative, and others with ergative–absolutive.

The split is usually conditioned by one of the following: