E XHIBIT 31.2


C ERTIFICATIONS




I, Larry E. Lentych, Chief
Financial Officer, certify that:




1. I have reviewed this
annual report on Form 10-K of 1st Source Corporation;




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 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


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:




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 20,
2009




/s/ LARRY E.
LENTYCH


Larry
E. Lentych, Chief Financial Officer