THIRD AMENDED AND RESTATED SECURED REVOLVING LINE OF CREDIT NOTE

Exhibit 10.26

THIRD AMENDED AND RESTATED

SECURED REVOLVING LINE OF CREDIT NOTE

FOR VALUE RECEIVED, HURON CONSULTING GROUP INC., a Delaware corporation and HURON CONSULTING SERVICES LLC, a Delaware limited liability company f/k/a Huron Consulting Group LLC (“Subsidiary”) (each of the foregoing two entities are hereby collectively referred to herein as the Borrower), jointly and severally promise to pay to the order of LASALLE BANK NATIONAL ASSOCIATION (the “Bank”), at such place as Bank may from time to time designate in writing, the principal sum of TWENTY-FIVE MILLION AND NO/100 DOLLARS ($25,000,000.00) , or such lesser principal sum as may then be owed by Borrower to Bank hereunder. Any principal that is borrowed and repaid hereunder may be borrowed again in accordance with the terms of this Note and that certain Amended and Restated Loan and Security Agreement of even date herewith between Borrower and Bank pursuant to which this Note is being delivered (the “Loan Agreement”). Except as hereinafter provided, Borrower’s obligations and liabilities to Bank under this Note (collectively, the “Borrower’s Liabilities”) unpaid from time to time shall bear interest at the rate(s) hereinafter set forth from the date advanced, disbursed or otherwise incurred until paid.

All outstanding principal shall be payable on or prior to February 10, 2006 (the “Maturity Date”).

The amount of principal hereunder shall bear interest as provided in the Loan Agreement.

In no event will the interest rate hereunder exceed that permitted by applicable law. If any interest or other charge is finally determined by a court of competent jurisdiction to exceed the maximum amount permitted by law, the interest or charge shall be reduced to the maximum permitted by law, and the Bank may credit any excess amount previously collected against the balance due or refund the amount to the Borrower.

Any check, draft or similar item of payment by or for the account of Borrower delivered to Bank on account of Borrower’s Liabilities shall, provided the same is honored by Bank and final settlement thereof is reflected by irrevocable credit to Bank, be applied by Bank on account of Borrower’s Liabilities in accordance with Bank’s funds availability schedule and in such order as Bank shall determine in its sole discretion.

Borrower warrants and represents to Bank and covenants with Bank that Borrower is not in the business of extending credit for the purpose of purchasing or carrying m