Nicor Inc.
                                                                      Form 10-Q
                                                                   Exhibit 31.1

                                  CERTIFICATION

I, Russ M. Strobel, certify that:

1)  I have reviewed this quarterly report on Form 10-Q of Nicor 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    May 3, 2005          /s/ RUSS M. STROBEL
         -----------------      ------------------------------------
                                 Russ M. Strobel
                                 President and Chief Executive Officer