**Exhibit 31.1**

 

**CERTIFICATIONPURSUANT TO SECTION 302(a) OF THE SARBANES-OXLEY ACT OF 2002**

 

I, G. Patrick Lynch, certify that:

 

1.                             I have reviewedthis quarterly report on Form 10-QSB of Northern TechnologiesInternational Corporation;

 

2.                             Based on myknowledge, this report does not contain any untrue statement of a material factor omit to state a material fact necessary to make the statements made, inlight of the circumstances under which such statements were made, notmisleading with respect to the period covered by this report;

 

3.                             Based on myknowledge, the financial statements, and other financial information includedin this report, fairly present in all material respects the financialcondition, results of operations and cash flows of the small business issuer asof, and for, the periods presented in this report;

 

4.                             The smallbusiness issuer’s other certifying officers and I are responsible forestablishing and maintaining disclosure controls and procedures (as defined inExchange Act Rules 13a-15(e) and 15d-15(e)) for the small businessissuer and have:

 

(a)      Designed such disclosurecontrols and procedures, or caused such disclosure controls and procedures tobe designed under our supervision, to ensure that material information relatingto the small business issuer, including its consolidated subsidiaries, is madeknown to us by others within those entities, particularly during the period inwhich this report is being prepared;

 

(b)      Evaluated theeffectiveness of the small business issuer’s disclosure controls and proceduresand presented in this report our conclusions about the effectiveness of thedisclosure controls and procedures, as of the end of the period covered by thisreport based on such evaluation; and

 

(c)      Disclosed in this reportany change in the small business issuer’s internal control over financialreporting that occurred during the small business issuer’s fourth quarter thathas materially affected, or is reasonably likely to materially affect, thesmall business issuer’s internal control over financial reporting; and

 

5.                             The smallbusiness issuer’s other certifying officers and I have disclosed, based on ourmost recent evaluation of internal controls over financial reporting, to thesmall business issuer’s auditors and the audit committee of the small businessissuer’s board of directors (or persons performing the equivalent function):

 

(a)       All significantdeficiencies and material weaknesses in the design or operation of internalcontrols over financial reporting which are reasonably likely to adverselyaffect the small business issuer’s ability to record, process, summarize andreport financial information; and

 

(b)      Any fraud, whether or not material, that involves management orother employees who have a significant role in the small business issuer’sinternal controls over financial reporting.

 
| Date:  July 11, 2008 |                                              |
|---------------------------|----------------------------------------------|
|                      |  G. Patrick Lynch                       |
|                      |  President and Chief  Executive Officer |

 

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