Exhibit 31.2

Certification of Chief Financial Officer

Pursuant to Section 302 of
the Sarbanes-Oxley Act of 2002

I, David A. Miller, certify that:

1) I have reviewed this Annual Report on Form 10-K of OBA Financial Services, 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 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 the Companys supervision, to ensure that material information relating to the registrant, including its consolidated subsidiary, 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 the Companys 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 and I have disclosed, based on the
Companys 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: September 28, 2011

|                                                 
|-------------------------------------------------
|                                                 
|/s/    DAVID A.
MILLER                           
|David A. Miller                                  
|Senior Vice President and Chief Financial Officer