Exhibit 31.2

CERTIFICATION

I, George S. Rapp, Executive Vice
President and Chief Financial Officer, certify, that:

|1. |  | I have reviewed this annual report on Form 10-K of
      Harleysville National Corporation.                                                                                                                                                                                                                                                                 
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|2. |  | Based on my knowledge, the 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 annual report.             
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|3. |  | Based on my knowledge, the financial statements, and
      other financial information included in this annual 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 annual 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:
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| | (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;         
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| | (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;                
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| | (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                                                                                                           
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| | (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 reasonable 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 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 reasonable likely to adversely affect the
      registrants ability to record, process, summarize and report financial
      information; and
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| | (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: March 7, 2008
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|By: | /s/ George S.
      Rapp                                   | 
|--- | ---------------------------------------------------------- | 
|    | Executive Vice President and Chief Financial
      Officer
|    | Harleysville National Corporation                         

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