UNITED ~~STATESSECURITIES~~STATES SECURITIES AND EXCHANGE ~~COMMISSIONWashington, D.C. 20549~~COMMISSION

~~Form~~Washington, ~~6-K~~D.C. 20549

~~REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a~~FORM 6-~~16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934~~K

REPORT OF FOREIGN PRIVATE ISSUER
PURSUANT TO RULE 13a-16 OR 15d-16
OF THE SECURITIES EXCHANGE ACT OF 1934

For the month of April 2019

Commission File Number: ~~333~~001-~~219066~~38177

Clementia Pharmaceuticals Inc.~~(Translation of registrant's name into English)~~

~~1000 de la Gauchetiere Street West, Suite 1200Montreal, Quebec, CANADA , H3B 4W5~~ (~~Address~~Translation of ~~principal~~registrant’s name ~~executive~~into ~~office~~English)

~~Indicate~~1000 byde ~~check~~la ~~mark~~Gauchetiere ~~whether~~Street ~~the~~West, Suite ~~registrant~~1200 Montreal, ~~files~~Quebec, orCanada ~~will~~H3B ~~file~~4W5 (Address ~~annual reports under cover~~ of ~~Form~~principal ~~20-F~~executive ~~or Form 40-F.Form 20-F [ X ] Form 40-F [ ]~~office)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F ý Form 40-F ¨

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):

Note: Regulation S-T Rule 101(b)(1) only permits the submission in paper of a Form 6-K if submitted solely to provide an attached annual report to security holders.

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):

~~Note: Regulation~~DOCUMENTS ~~S-T~~FURNISHED ~~Rule~~AS ~~101(b)(7)~~PART ~~only~~OF ~~permits~~THIS ~~the submission in paper of a Form~~ FORM 6-K if submitted to furnish a report or other document that the registrant foreign private issuer must furnish and make public under the laws of the jurisdiction in which the registrant is incorporated, domiciled or legally organized (the registrant's "home country"), or under the rules of the home country exchange on which the registrant's securities are traded, as long as the report or other document is not a press release, is not required to be and has not been distributed to the registrant's security holders, and, if discussing a material event, has already been the subject of a Form 6-K submission or other Commission filing on EDGAR.

~~The~~A ~~information~~press ~~contained~~release indated ~~this~~April ~~Report~~18, ~~(including the exhibits hereto) is hereby incorporated by reference into Clementia Pharmaceuticals Inc~~2019.~~’s Registration Statement on Form F-3 (File No. 333-227726).~~

On April 11, 2019, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference. (c) Exhibit 99.1. Press release dated April 11, 2019Exhibits

99.1 – Press Release dated April 18, 2019

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

		Clementia Pharmaceuticals Inc.
	CLEMENTIA PHARMACEUTICALS INC.
		(Registrant)
Date: April 18, 2019	By:	/s/ Steve Forte
Date: April 11, 2019		/s/ Steve Forte
		Name:	Steve Forte
		Steve Forte
		Title:	Chief Financial Officer
		Chief Financial Officer

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