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                           July 19, 2023

       John Wasson
       Chief Executive Officer
       ICF International, Inc.
       1902 Reston Metro Plaza
       Reston, VA 20190

                                                        Re: ICF International,
Inc.
                                                            Form 10-K for the
Fiscal Year Ended December 31, 2022
                                                            Response dated June
12, 2023
                                                            File No. 1-33045

       Dear John Wasson:

               We have reviewed your June 12, 2023 response to our comment
letter and have the
       following comment. In our comment, we may ask you to provide us with
information so we may
       better understand your disclosure.

              Please respond to this comment within ten business days by
providing the requested
       information or advise us as soon as possible when you will respond. If
you do not believe our
       comment applies to your facts and circumstances, please tell us why in
your response.

             After reviewing your response to this comment, we may have
additional
       comments. Unless we note otherwise, our references to prior comments are
to comments in our
       May 30, 2023 letter.

       Form 10-K for the Fiscal Year Ended December 31, 2022

       Item 7. Management's Discussion and Analysis of Financial Condition and
Results of Operations
       Non-GAAP Measures
       Service Revenues, page 45

   1.                                                   We note your response
to comment 1. It appears that the effect of your adjustment on
                                                        GAAP revenue changes
the recognition and measurement principles required to be
                                                        applied in accordance
with GAAP which is considered individually tailored. Please revise
                                                        your presentation to
omit this adjustment and measures (EBITDA Margin on Service
                                                        Revenue and Adjusted
EBITDA Margin on Service Revenue) used in your press releases
                                                        on Form 8-K where you
use service revenue in the denominator. Refer to Question
                                                        100.04 of Compliance
and Disclosure Interpretations on Non-GAAP Financial Measures.
 John Wasson
ICF International, Inc.
July 19, 2023
Page 2

       You may contact Tony Watson at 202-551-3318 or Joel Parker at
202-551-3651 if you
have questions regarding comments on the financial statements and related
matters.



FirstName LastNameJohn Wasson                           Sincerely,
Comapany NameICF International, Inc.
                                                        Division of Corporation
Finance
July 19, 2023 Page 2                                    Office of Trade &
Services
FirstName LastName