UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. ________________ )*

ICON OIL & GAS FUND-A L.P.

(Name of Issuer)

Units of limited partnership interests

(Title of Class of Securities)

4511B 106

(CUSIP Number)

July 9, 2013

(Date of Event Which Requires Filing of this Statement)

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

¨ Rule 13d-1(b)

ý Rule 13d-1(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).

Page 1 of 5 pages

CUSIP No. 4511B 106

1. Names of Reporting Persons:

Mark E. Lavery

2. Check the Appropriate Box if a Member of a Group (See Instructions):

(a)

(b) ý

3. SEC Use Only

4. Citizenship or Place of Organization: United States of America

Number of Shares Beneficially Owned by Each Reporting Person With:

5. Sole Voting Power: 21

6. Shared Voting Power: 0

7. Sole Dispositive Power: 21

8. Shared Dispositive Power: 0

9. Aggregate Amount Beneficially Owned by Each Reporting Person: 21

10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions):

11. Percent of Class Represented by Amount in Row (9): 10.4%

12. Type of Reporting Person (See Instructions): IN

Page 2 of 5 pages

Item 1.

(a) Name of Issuer: ICON Oil & Gas Fund-A L.P.

(b) Address of Issuer’s Principal Executive Offices: 3 Park Avenue, 36 th Floor, New York, New York 10016

Item 2.

(a) Name of Persons Filing:

Mark E. Lavery

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

Address for Mark E. Lavery:

P.O. Box 582

Saint Albans, MO 63073

United States of America

(d) Title of Class of Securities: Units of limited partnership interests

(e) CUSIP Number: 45111B 106

Item 3. If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

Not applicable.

Page 3 of 5 pages

Item 4. Ownership.

(a) Amount beneficially owned: 21

(b) Percent of class: 10.4%

(i) Sole power to vote or to direct the vote: 21

(ii) Shared power to vote or to direct the vote: 0

(iii) Sole power to dispose or to direct the disposition of: 21

(iv) Shared power to dispose or to direct the disposition of: 0

Item 5. Ownership of Five Percent or Less of a Class.

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 five percent of the class of securities, check the following: ¨.

Item 6. Ownership of More than Five Percent on Behalf of Another Person.

Not applicable.

Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.

Not applicable.

Item 8. Identification and Classification of Members of the Group.

Not applicable.

Item 9. Notice of Dissolution of Group.

Not applicable.

Page 4 of 5 pages

Item 10. Certifications.

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.

SIGNATURE

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

July 19, 2013

/s/ Mark E. Lavery

Mark E. Lavery

Page 5 of 5 pages

ICON Oil & Gas Fund-A L.P. SC 13G