EXHIBIT 23.1

            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the reference to our firm under the caption "Selected Financial
Data" and to the incorporation by reference in the Registration Statement (Form
S-8 No. 333-127131) pertaining to the Amended and Restated Stock Option Plan,
the 2003 Stock Option Plan and the 2005 Stock Incentive Plan of Unica
Corporation and the Registration Statement (Form S-8 No. 333-131483) pertaining
to the 2005 Employee Stock Purchase Plan, as amended of Unica Corporation of our
reports dated December 13, 2006, with respect to the consolidated financial
statements Unica Corporation, Unica Corporation management's assessment of the
effectiveness of internal control over financial reporting, and the
effectiveness of internal control over financial reporting of Unica Corporation
included in the Annual Report (Form 10-K) for the year ended September 30, 2006.

                                                 /s/ ERNST & YOUNG LLP

Boston, Massachusetts
December 13, 2006