Exhibit 31.1

CERTIFICATION

I, Rheo A. Brouillard, President and Chief Executive Officer of SI Financial Group, Inc., certify
that:



|1. | I have reviewed this annual report on Form 10-K of SI Financial Group, Inc.
|-- | ---------------------------------------------------------------------------



|2. | Based on my knowledge, this annual 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;

(b) 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 a date within 90 days prior to the filing of this annual report (the evaluation
date), based on such evaluation; and

(c) Disclosed in this report any change in the registrants internal
control over financial reporting that occurred as of the evaluation date 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.



/s/ Rheo A. BrouillardRheo A. BrouillardPresident and Chief Executive OfficerMarch 30, 2006