Exhibit 10.5

      

       

      

      ARYA SCIENCES ACQUISITION CORP III

      51 Astor Place, 10th Floor

      New York, New York 10003

       

      August 11, 2020

       

      ARYA Sciences Holdings III 

      

      c/o Perceptive Advisors

      51 Astor Place, 10th Floor

      New York, New York 10003

       

      Ladies and Gentlemen:

       

      This letter will confirm our agreement that, commencing on the effective date (the “Effective Date”) of the registration statement (the “Registration Statement”) for the
        initial public offering (the “IPO”) of the securities of ARYA Sciences Acquisition Corp III (the “Company”) and continuing until the earlier of (i) the consummation by the Company of an initial business combination and (ii) the Company’s liquidation (in each case
        as described in the Registration Statement) (such earlier date hereinafter referred to as the “Termination Date”), ARYA Sciences Holdings
        III (the “Sponsor”) shall take steps directly or indirectly to make available to the Company certain office space, secretarial and
        administrative services as may be required by the Company from time to time, situated at 51 Astor Place, 10th Floor, New York, New York 10003 (or any successor location). In exchange therefore, the Company shall pay the Sponsor a sum of $10,000 per
        month commencing on the Effective Date and continuing monthly thereafter until the Termination Date. The Sponsor hereby agrees that it does not have any right, title, interest or claim of any kind (a “Claim”) in or to any monies that may be set aside in a trust account (the “Trust
          Account”) that may be established in connection with and upon the consummation of the IPO and hereby irrevocably waives any Claim it presently has or may have in the future as a result of, or arising out of, any negotiations, contracts or
        agreements with the Company and will not seek recourse, reimbursement, payment or satisfaction of any Claim against the Trust Account or any monies or other assets in the Trust Account for any reason whatsoever.

       

      This letter agreement constitutes the entire agreement and understanding of the parties hereto in respect of its subject matter and supersedes all
        prior understandings, agreements, or representations by or among the parties hereto, written or oral, to the extent they relate in any way to the subject matter hereof or the transactions contemplated hereby.

       

      This letter agreement may not be amended, modified or waived as to any particular provision, except by a written instrument executed by the parties
        hereto.

       

      The parties may not assign this letter agreement and any of their rights, interests, or obligations hereunder without the consent of the other party.
        Any purported assignment in violation of this paragraph shall be void and ineffectual and shall not operate to transfer or assign any interest or title to the purported assignee.

       

      
        
          


      

      
      This letter agreement shall be governed by, construed in accordance with, and interpreted pursuant to the laws of the State of New York, without giving
        effect to its choice of laws principles that will apply the laws of another jurisdiction.

       

      This letter agreement may be executed in one or more counterparts, each of which shall for all purposes be deemed to be an original but all of which
        together shall constitute one and the same agreement. Only one such counterpart signed by the party against whom enforceability is sought needs to be produced to evidence the existence of this letter agreement.

       

      [Signature Page Follows]

       

      

      
        2

        
          


      

      	 	
              Very truly yours,

            
	 	 
	 	
              ARYA SCIENCES ACQUISITION CORP III

            
	 	 	 
	 	
              By:

            	
              /s/ Adam Stone

            
	 	
              Name:

            	
              Adam Stone

            
	 	
              Title:

            	
              Chief Executive Officer

            


      

      

      	
              AGREED TO AND ACCEPTED BY:

            	 
	 	 
	
              ARYA SCIENCES HOLDINGS III

            	 
	 	 	 
	
              By:

            	
              /s/ Adam Stone

            	 
	
              Name:

            	
              Adam Stone

            	 
	
              Title:

            	
              Authorized Signatory