Exhibit
31.2



CERTIFICATION OF PRINCIPAL FINANCIAL
OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY
ACT OF 2002



I, Andrew Williams, certify that:



1. I have reviewed this Quarterly Report
on Form 10-Q of Cynapsus Therapeutics Inc.;



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)) for the registrant and have:



(a) Designed such disclosure controls
and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material
information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities,
particularly during the period in which this report is being prepared;



(c) Evaluated the effectiveness of the
registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the
disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and



(d) Disclosed in this report any change
in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal
quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably
likely to materially affect, the registrant’s internal control over financial reporting; and



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 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



(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: August 10,     2016 | /s/ Andrew Williams                                                             
|------------------------- | --------------------------------------------------------------------------------
|                          | Andrew Williams                                                                 
|                          | Chief Operating Officer and Chief Financial Officer(principal financial officer)