EXHIBIT 31.1

CERTIFICATION PURSUANT TOSECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

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|I, Elazar Rabbani,
Ph.D., certify that:
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|1.                                      | I have reviewed
this quarterly report on Form 10-Q of Enzo Biochem, Inc (the registrant).                                                                                                                                                                                                                                             
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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;                              
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|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;                                                 
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|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:
|                                        |                                                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                                                                                               
|                                        | (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 that has
materially affected, or is reasonably likely to materially affect, the
registrants internal control over financial reporting; and                                                                
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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 audit committee of the registrants board of directors (or
persons performing the equivalent functions):                                         
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|                                        | (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: June 9, 2011

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| | --- | ------------------------------------------------------------
| | By: | /s/ Elazar
Rabbani, Ph.D.                                   
| |     |                                                             
| |     | Elazar Rabbani,
Ph.D.                                       
| |     | Chairman of the
Board, Chief Executive Officer and Secretary

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