The Targum To Ketuvim
Western targumim exist on Sifrei Emet, on the Five Megillot and on Chronicles, i.e. on all the books of Ketuvim besides Daniel and Ezra (which contain large portions in Aramaic anyway). There are several complementary targumim to Esther.
There is, however, no "official" eastern (Babylonian) targum to Ketuvim, equivalent to Targum Onkelos on the Torah and Targum Jonathan on Nevi'im. In fact, the Babylonian Talmud explicitly notes the lack of a Targum to Ketuvim, explaining that Jonathan ben Uzziel was divinely prevented from completing his translation of the Bible. A more prosaic explanation may consist in the lack of formal readings of Ketuvim in the synagogue, making it unnecessary to have an official system for line-by-line translation.
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