UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No.   )*

Celsion Corporation

(Name of Issuer)

Common Stock, $0.01 par value per share

(Title of Class of Securities)

15117N503

(CUSIP Number)

June 19, 2017

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

a.         ☐ Rule 13d-1(b)

b.         ☒ Rule 13d-1(c)

c.         ☐ Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 15117N503

CUSIP No. 15117N503

CUSIP No. 15117N503

Item 1.

(a) Name of Issuer

Celsion Corporation (the “Issuer”)

(b) Address of Issuer’s Principal Executive Offices

997 Lenox Drive, Suite 100

Lawrenceville, New Jersey 08648-2311

Item 2.

(a) Name of Person Filing

(b) Address of Principal Business Office or, if none, Residence

(c) Citizenship

This Schedule 13G is being filed on behalf of (i) Mitchell P. Kopin, an individual who is a citizen of the United States of America (“Mr. Kopin”), (ii) Daniel B. Asher, an individual who is a citizen of the United States of America (“Mr. Asher”) and (iii) Intracoastal Capital LLC, a Delaware limited liability company (“Intracoastal” and together with Mr. Kopin and Mr. Asher, collectively the “Reporting Persons”).

The Reporting Persons have entered into a Joint Filing Agreement, a copy of which is filed with this Schedule 13G as Exhibit 1, pursuant to which the Reporting Persons have agreed to file this Schedule 13G jointly in accordance with the provisions of Rule 13d-1(k) of the Securities Exchange Act of 1934, as amended.

The principal business office of Mr. Kopin and Intracoastal is 245 Palm Trail, Delray Beach, Florida 33483.

The principal business office of Mr. Asher is 111 W. Jackson Boulevard, Suite 2000, Chicago, Illinois 60604.

(d) Title of Class of Securities

Common stock, $0.01 par value per share, of the Issuer (the “Common Stock”).

(e) CUSIP Number

15117N503

Not applicable.

(a) and (b):

(i)         Immediately following the execution of the Securities Purchase Agreement with the Issuer on June 19, 2017 (the “SPA”) (as disclosed in the Form 8-K filed by the Issuer with the Securities and Exchange Commission on June 19, 2017), each of the Reporting Persons may be deemed to have beneficial ownership of 598,150 shares of Common Stock, which consists of (i) 585,000 shares of Common Stock that was to be issued to Intracoastal at the closing of the transaction contemplated by the SPA and (ii) 13,150 shares of Common Stock issuable upon exercise of a warrant that was to be issued to Intracoastal at the closing of the transaction contemplated by the SPA (“Intracoastal Warrant 1”), and all such shares of Common Stock in the aggregate represent beneficial ownership of approximately 9.99% of the Common Stock, based on (1) 5,389,339 shares of Common Stock outstanding as of June 19, 2017 as reported by the Issuer, plus (2) 13,150 shares of Common Stock issuable upon exercise of Intracoastal Warrant 1. The foregoing excludes (I) 571,850 shares of Common Stock issuable upon exercise of Intracoastal Warrant 1 because Intracoastal Warrant 1 contains a blocker provision under which the holder thereof does not have the right to exercise Intracoastal Warrant 1 to the extent that such exercise would result in beneficial ownership by the holder thereof, together with any persons whose beneficial ownership of the Common Stock would or could be aggregated with such holder’s for purposes of Section 13(d) of the Securities Exchange Act of 1934, of more than 9.99% of the Common Stock, (II) 585,000 shares of Common Stock issuable upon exercise of a second warrant that was to be issued to Intracoastal at the closing of the transaction contemplated by the SPA (“Intracoastal Warrant 2”) because Intracoastal Warrant 2 is not exercisable until six months following the issuance thereof (and Intracoastal Warrant 2 contains a blocker provision under which the holder thereof does not have the right to exercise Intracoastal Warrant 2 to the extent that such exercise would result in beneficial ownership by the holder thereof, together with any persons whose beneficial ownership of the Common Stock would or could be aggregated with such holder’s for purposes of Section 13(d) of the Securities Exchange Act of 1934, of more than 9.99% of the Common Stock), (III) 102,040 shares of Common Stock issuable upon exercise of a warrant held by Intracoastal (“Intracoastal Warrant 3”) because Intracoastal Warrant 3 contains a blocker provision under which the holder thereof does not have the right to exercise Intracoastal Warrant 3 to the extent that such exercise would result in beneficial ownership by the holder thereof, together with any persons whose beneficial ownership of the Common Stock would or could be aggregated with such holder’s for purposes of Section 13(d) of the Securities Exchange Act of 1934, of more than 9.99% of the Common Stock and (IV) 2,425 shares of Common Stock issuable upon exercise of a second warrant held by Intracoastal (“Intracoastal Warrant 4”) because Intracoastal Warrant 4 contains a blocker provision under which the holder thereof does not have the right to exercise Intracoastal Warrant 4 to the extent that such exercise would result in beneficial ownership by the holder thereof, together with any persons whose beneficial ownership of the Common Stock would or could be aggregated with such holder’s for purposes of Section 13(d) of the Securities Exchange Act of 1934, of more than 4.99% of the Common Stock. Without such blocker provisions (and assuming Intracoastal Warrant 2 was currently exercisable), each of the Reporting Persons may have been deemed to have beneficial ownership of 1,859,465 shares of Common Stock.

(ii)        Immediately following the termination of the transactions contemplated by the SPA on June 22, 2017 (as disclosed in the Form 8-K filed by the Issuer with the Securities and Exchange Commission on June 22, 2017), each of the Reporting Persons may have been deemed to have beneficial ownership of 104,465 shares of Common Stock, which consisted of (i) 102,040 shares of Common Stock issuable upon exercise of Intracoastal Warrant 3, and (ii) 2,425 shares of Common Stock issuable upon exercise of Intracoastal Warrant 4, and all such shares of Common Stock in the aggregate represented beneficial ownership of approximately 1.9% of the Common Stock, based on (1) 5,389,339 shares of Common Stock outstanding as of June 19, 2017 as reported by the Issuer, plus (2) 102,040 shares of Common Stock issuable upon exercise of Intracoastal Warrant 1, and (3) 2,425 shares of Common Stock issuable upon exercise of the Intracoastal Warrant 4.

(iii)       Each of the Reporting Persons may have been deemed to have beneficial ownership of 374,636 shares of Common Stock during the period commencing on June 22, 2017, and ending on June 27, 2017, that were required to be purchased by Intracoastal as a result of such termination of the SPA.

(iv)       As of close of business on June 29, 2017, each of the Reporting Persons may have been deemed to have beneficial ownership of 83,965 shares of Common Stock, which consisted of (i) 81,540 shares of Common Stock held by Intracoastal, and (ii) 2,425 shares of Common Stock issuable upon exercise of Intracoastal Warrant 4, and all such shares of Common Stock in the aggregate represented beneficial ownership of approximately 1.5% of the Common Stock, based on (1) 5,389,339 shares of Common Stock outstanding as of June 19, 2017 as reported by the Issuer, plus (2) 102,040 shares of Common Stock which were issued upon exercise of Intracoastal Warrant 3 on June 27, 2017, and (3) 2,425 shares of Common Stock issuable upon exercise of the Intracoastal Warrant 4.

(c)

Number of shares as to which each Reporting Person has:

(1) Sole power to vote or to direct the vote: 0.

(2) Shared power to vote or to direct the vote: 83,965.

(3) Sole power to dispose or to direct the disposition of 0.

(4) Shared power to dispose or to direct the disposition of 2,425.

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than 5 percent of the class of securities, check the following þ.

Not applicable.

Not applicable.

Not applicable.

Not applicable.

Item 10. Certification

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under §240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Exhibit 1

JOINT FILING AGREEMENT

The undersigned acknowledge and agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13G may be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate.

Page 9 of 9