September 28, 2023

VIA ELECTRONIC FILING

Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Attention:   Division of Investment Management

RE: BlackRock Sustainable Balanced Fund, Inc.

Post-Effective Amendment No. 85 to the Registration Statement on Form N-1A

(Securities Act File No. 2-49007, Investment Company Act File No. 811-2405)

Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended (the “1933 Act”), BlackRock Sustainable Balanced Fund, Inc. (the “Registrant”) hereby certifies that:

(1) the form of Prospectuses and Statement of Additional Information that would have been filed pursuant to Rule 497(c) under the 1933 Act would not have differed from that contained in Post-Effective Amendment No. 85 to the Registration Statement on Form N-1A of the Registrant; and

(2) the text of Post-Effective Amendment No. 85 to the Registration Statement on Form N-1A of the Registrant was filed electronically with the Securities and Exchange Commission on September 27, 2023.

Sincerely,

BlackRock Sustainable Balanced Fund, Inc.

/s/ Janey Ahn

Janey Ahn

Secretary of the Registrant