SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-A

FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES

PURSUANT TO SECTION 12(b) OR 12(g) OF THE

SECURITIES EXCHANGE ACT OF 1934

Securities to be registered pursuant to Section 12(b) of the Act:

If this form relates to the registration of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective pursuant to General Instruction A.(c), check the following box.   x

If this form relates to the registration of a class of securities pursuant to Section 12(g) of the Exchange Act and is effective pursuant to General Instruction A.(d), check the following box.   ¨

Securities Act registration statement file number pursuant to which this form relates: 333-179887 ( if applicable )

Securities to be registered pursuant to Section 12(g) of the Act: None

INFORMATION REQUIRED IN REGISTRATION STATEMENT

Item 1. Description of Registrant’s Securities to be Registered.

Reference is hereby made to the section entitled “Description of Shares” in Part A of the Registration Statement on Form N-2 of PIMCO Dynamic Income Fund, as filed with the Securities and Exchange Commission on March 2, 2012, as amended April 26, 2012, April 27, 2012, and May 11, 2012, and as may be amended further (Securities Act File No. 333-179887 and Investment Company Act File No. 811-22673).

Item 2. Exhibits

Pursuant to the Instructions as to Exhibits, no Exhibits are filed herewith or incorporated herein by reference.

[Signature Page Follows.]

SIGNATURE

A copy of the Amended and Restated Agreement and Declaration of Trust of the registrant is on file with the Secretary of The Commonwealth of Massachusetts, and notice is hereby given that this instrument is executed on behalf of the registrant by an officer of the registrant in his capacity as an officer of the registrant, and not individually, and that the obligations arising out of this instrument are not binding upon any of the trustees, officers or shareholders individually, but binding only upon the assets and property of the registrant.

Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereto duly authorized.

(Registrant) PIMCO Dynamic Income Fund

Date: May 14, 2012