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                             May 1, 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
                                                            Filed March 1, 2023
                                                            Form 8-K Filed
February 28, 2023
                                                            File No. 1-33045

       Dear John Wasson:

              We have reviewed your filings and have the following comments. In
some of our
       comments, we may ask you to provide us with information so we may better
understand your
       disclosure.

              Please respond to these comments 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
       comments apply to your facts and circumstances, please tell us why in
your response.

                                                        After reviewing your
response to these comments, we may have additional comments.

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

       EBITDA and Adjusted EBITDA, page 45

   1.                                                   We note that you make
an adjustments for additional rent as result of talking possession of
                                                        your new corporate
headquarters in your calculations of adjusted EBITDA and non-
                                                        GAAP diluted earnings
per share. Please tell us how you determined that these costs are
                                                        not normal, recurring,
cash operating expenses. Refer to Question 100.01 of the Non-
                                                        GAAP Financial Measures
Compliance and Disclosure Interpretations.
       Item 7. Management's Discussion and Analysis of Financial Condition and
Results of Operations
       Non-GAAP Measures
       Service Revenue, page 45

   2.                                                   Please tell us if
subcontractor and other direct costs subtracted from revenues have any
 John Wasson
ICF International, Inc.
May 1, 2023
Page 2
         margin associated with the costs or are they true pass through type of
costs in which case
         the same amount is included in revenue and direct costs in your
consolidated statements of
         comprehensive income.
Form 8-K Filed February 28, 2023

Exhibit 99.1, page 1

3.       Reference is made to your use of Adjusted EBITDA Margin on Service
Revenue, a non-
         GAAP measure, throughout the presentation. Please present the most
directly comparable
         financial measure calculated and presented in accordance with GAAP.
Refer to Rule
         100(a)(1) of Regulation G.
        We remind you that the company and its management are responsible for
the accuracy
and adequacy of their disclosures, notwithstanding any review, comments, action
or absence of
action by the staff.

       You may contact Tony Watson at (202) 551-3318 or Joel Parker at (202)
551-3651 if you
have questions.



FirstName LastNameJohn Wasson                                Sincerely,
Comapany NameICF International, Inc.
                                                             Division of
Corporation Finance
May 1, 2023 Page 2                                           Office of Trade &
Services
FirstName LastName