September 14, 2020 First Trust Exchange-Traded Fund III

September 14, 2020

First Trust Exchange-Traded Fund III

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Re: Fee Waiver Amendment and Extension Agreement Letter for First Trust Ultra Short Duration Municipal ETF (the “Fund”), a series of First Trust Exchange-Traded Fund III (the “Trust”)

Ladies and Gentlemen:

Reference is hereby made to that certain Fee Waiver Agreement between the Trust, on behalf of the Fund, and First Trust Advisors L.P., the investment advisor to the Fund (the “Advisor”), dated as of November 1, 2018, as amended and the Second Fee Waiver Agreement between the Trust, on behalf of the Fund, and the Advisor, dated as of September 14, 2020 (collectively, the “Agreement”). Capitalized terms used herein but not otherwise defined shall have the meanings attributed to them in the Agreement.

Notwithstanding anything to the contrary in the Agreement, the Advisor hereby agrees to waive investment management fees otherwise payable to it by the Fund in the amount of 0.20% of the Fund’s average daily net assets (the “Waived Amount”) and that the Waiver Term shall continue until November 30, 2021. The parties hereby acknowledge that with the exception of the Waiver Term, the Agreement shall remain in full force and effect.

Very Truly Yours,

FIRST TRUST ADVISORS L.P.

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Chief Financial Officer

AGREED AND ACKNOWLEDGED:

First Trust Exchange-Traded Fund III,

on behalf of First Trust Ultra Short Duration Municipal ETF

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Treasurer, Chief Financial Officer and

Chief Accounting Officer