CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Post-Effective Amendment
No. 47 to Registration Statement Amendment No. 33-34801 on Form N-1A of our
report dated December 23, 2016, relating to the financial statements and
financial highlights of Pioneer Mid Cap Value Fund (the "Fund"), appearing in
the Annual Report on Form N-CSR of the Fund for the year ended October 31, 2016.
We also consent to the references to us under the headings "Financial
Highlights" in the Prospectus and "Independent Registered Public Accounting
Firm" and "Financial Statements" in the Statement of Additional Information,
which are part of such Registration Statement.

/s/ DELOITTE & TOUCHE LLP

Boston, Massachusetts
February 27, 2017