Exhibit 5.1

				John Hancock Tower, 20th Floor
				200 Clarendon Street
				Boston, Massachusetts 02116
				Tel: +1.617.948.6000 Fax: +1.617.948.6001
				www.lw.com
				FIRM / AFFILIATE OFFICES
				Abu Dhabi		Milan
				Barcelona		Moscow
				Beijing		Munich
				Boston		New Jersey
				Brussels		New York
				Chicago		Orange County
				Doha		Paris
				Dubai		Riyadh
				Düsseldorf		Rome
September 19, 2013				Frankfurt		San Diego
				Hamburg		San Francisco
				Hong Kong		Shanghai
				Houston		Silicon Valley
				London		Singapore
BIND Therapeutics, Inc.				Los Angeles		Tokyo
325 Vassar Street				Madrid		Washington, D.C.
Cambridge, Massachusetts 02139
				File No. 049712-0014

5,405,000 shares of Common Stock, $0.0001 par value per share

Ladies and Gentlemen:

We have acted as special counsel to BIND Therapeutics, Inc., a Delaware corporation (the “Company”), in connection with the proposed issuance of up to 5,405,000 shares (including shares subject to the underwriters’ option to purchase additional shares) of common stock, $0.0001 par value per share (the “Shares”). The Shares are included in a registration statement on Form S–1 under the Securities Act of 1933, as amended (the “Act”), filed with the Securities and Exchange Commission (the “Commission”) on August 12, 2013 (Registration No. 333-190566) (as amended, the “Registration Statement”). The term “Shares” shall include any additional shares of common stock registered by the Company pursuant to Rule 462(b) under the Act in connection with the offering contemplated by the Registration Statement. This opinion is being furnished in connection with the requirements of Item 601(b)(5) of Regulation S-K under the Act, and no opinion is expressed herein as to any matter pertaining to the contents of the Registration Statement or related Prospectus, other than as expressly stated herein with respect to the issue of the Shares.

As such counsel, we have examined such matters of fact and questions of law as we have considered appropriate for purposes of this letter. With your consent, we have relied upon certificates and other assurances of officers of the Company and others as to factual matters without having independently verified such factual matters. We are opining herein as to General Corporation Law of the State of Delaware and we express no opinion with respect to any other laws.

Subject to the foregoing and the other matters set forth herein, it is our opinion that, as of the date hereof, when the Shares shall have been duly registered on the books of the transfer agent and registrar therefor in the name or on behalf of the purchasers, and have been issued by the Company against payment therefor

BIND Therapeutics, Inc.

September 19, 2013

Page 2

in the circumstances contemplated by the form of underwriting agreement most recently filed as an exhibit to the Registration Statement, the issue and sale of the Shares will have been duly authorized by all necessary corporate action of the Company, and the Shares will be validly issued, fully paid and nonassessable. In rendering the foregoing opinion, we have assumed that the Company will comply with all applicable notice requirements regarding uncertificated shares provided in the General Corporation Law of the State of Delaware.

This opinion is for your benefit in connection with the Registration Statement and may be relied upon by you and by persons entitled to rely upon it pursuant to the applicable provisions of the Act. We consent to your filing this opinion as an exhibit to the Registration Statement and to the reference to our firm in the Prospectus under the heading “Legal Matters.” We further consent to the incorporation by reference of this letter and consent into any registration statement filed pursuant to Rule 462(b) with respect to the Shares. In giving such consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Commission thereunder.

Very truly yours,

/s/ Latham & Watkins LLP