The paper discusses instances of marking the subject of an embedded clause with the accusative case in some Altaic languages. Fully considered and compared are the data of the Korean and Tuvinian languages, involving some data from other Altaic languages as well. Study is made of the issue of whether these constructions in Altaic languages can be considered as particular instances of constructions with argument dislocation or of those with Subject-to-Object raising (in English). The data of the Korean language show, that on the whole, this construction is similar to the English construction. The Tuvinian construction with a non-finite embedded clause does not have a sufficient number of diagnostic features to consider it an instance of the Subject-to-Object raising construction. Besides, in many Altaic languages, the accusative case on an embedded predication subject is used to mark the topical communicative properties of this subject.