Exhibit 32.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. § 1350 AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Reef Oil & Gas Income and Development Fund III, L.P. (the Partnership) on Form 10-K for the fiscal year ended December 31, 2013 as filed with the Securities and Exchange Commission on the date hereof (the Report), I, Daniel C. Sibley, principal financial officer of Reef Oil & Gas Income and Development Fund III, L.P., certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Partnership.

Date: March 31, 2014
	/s/ Daniel C. Sibley
	Daniel C. Sibley
	Chief Financial Officer and General Counsel of
	Reef Exploration, L.P.
	(Principal Financial and Accounting Officer)

This certification accompanies the Report pursuant to §906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the Sarbanes-Oxley Act of 2002, be deemed filed by the Partnership for purposes of §18 of the Securities Exchange Act of 1934, as amended.

A signed original of this written statement required by §906 has been provided to the Partnership and will be retained by the partnership and furnished to the Securities and Exchange Commission or its staff upon request.