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,
2020
By:
/s/ Victor
SanchezVictor
SanchezChief Executive
Officer(principal
executive officer)