EXHIBIT 31.1





CERTIFICATION
OF PRINCIPAL EXECUTIVE OFFICER


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





I, Victor Sanchez,
certify that:





1. I have reviewed
this annual report on Form 10-K/A of Pharma-Bio Serv
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(s) 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:





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;





b) Designed such
internal control over financial reporting, or caused such internal
control over financial reporting to be designed under our
supervision, to provide reasonable assurance regarding the
reliability of financial reporting and the preparation of financial
statements for external purposes in accordance with generally
accepted accounting principles;





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(s) 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: February 28,
2017
By:
/s/ Victor
SanchezVictor
SanchezChief Executive
Officer(principal
executive officer)