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Exhibit 12.1

|SECTION 302 CERTIFICATION               
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|CERTIFICATION OF CHIEF EXECUTIVE OFFICER

I, Joseph Fuda, certify that:

|1. | I have reviewed this annual report on Form 20-F of
      Micromem Technologies Inc. for the Fiscal Year Ended October 31,
    2017;                                                                                                                                                                                                                          
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|   |                                                                                                                                                                                                                                                                                                                                                              
|2. | Based on my knowledge, this report does not contain any
      untrue statement of a material fact or omit to state a material fact
      necessary to make the statements made, in light of the circumstances under
      which such statements were made, not misleading with respect to the period
      covered by this report;                           
|   |                                                                                                                                                                                                                                                                                                                                                              
|3. | Based on my knowledge, the financial statements, and
      other financial information included in this report, fairly present in all
      material respects the financial condition, results of operations and cash
      flows of the registrant as of, and for, the periods presented in this
      report;                                              
|   |                                                                                                                                                                                                                                                                                                                                                              
|4. | The registrant's other certifying officer and I are
      responsible for establishing and maintaining disclosure controls and
      procedures (as defined in Exchange Act Rules 13a- 15(e) and 15d-15(e)) and
      internal control over financial reporting (as defined in Exchange Act
      Rules 13a-15(f) and 15d-15(f)) for the registrant and have:
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|   | d.                                                                                                                                                                                                                                                                                                                                                           
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|5. | The registrant's other certifying officer and I have
      disclosed, based on our most recent evaluation of internal control over
      financial reporting, to the registrant's auditors and
the                                                                                                                                                           

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audit committee of the registrant's
board of directors (or persons performing the equivalent functions):

| | a. | All significant deficiencies and material weaknesses in
      the design or operation of internal control over financial reporting which
      are reasonably likely to adversely affect the registrant's ability to
      record, process, summarize and report financial information; and
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| |    |                                                                                                                                                                                                                                                                                            
| | b. | Any fraud, whether or not material, that involves
      management or other employees who have a significant role in the
      registrant's internal control over financial
reporting.                                                                                                     

|Date: March 12, 2018 | /s/
      Joseph Fuda        
|-------------------- | -----------------------------
|                     | Joseph Fuda                  
|                     | Chief Executive Officer      
|                     | (Principal executive officer)

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