Harleysville Group to Hold Second Quarter 2011 Earnings Conference Call on August 9, 2011

Harleysville Group Inc. (NASDAQ: HGIC) will hold a live webcast on Tuesday, August 9, 2011, beginning at 8 a.m. (ET) to discuss its second quarter 2011 earnings. The company will release its results on Monday, August 8, 2011, after the close of regular trading on the NASDAQ Stock Market.

The webcast and a replay will be available from the Investors section of the company’s website (www.harleysvillegroup.com).

Harleysville Insurance is a leading super-regional provider of insurance products and services for small and mid-sized businesses, as well as for individuals, and ranks among the top 70 U.S. property/casualty insurance groups based on net written premiums. As a Trusted Choice® company partner, Harleysville distributes its products exclusively through a network of independent agents primarily across 32 states. Harleysville is ranked #21 in the most recent InformationWeek 500, the publication’s annual listing of the most innovative information technology organizations in the U.S., and has been included on the list in each of the last five years. Harleysville Mutual Insurance Company owns approximately 54 percent of Harleysville Group Inc. (NASDAQ: HGIC), a publicly traded holding company for eight regional property/casualty insurance companies collectively rated A (Excellent) by A.M. Best Company. Harleysville Group is listed on the NASDAQ Global Select Market, which is comprised of the top third of all NASDAQ member companies and has the highest initial listing standards of any exchange in the world based on financial and liquidity requirements. Further information can be found on the company’s website at www.harleysvillegroup.com.

Certain of the statements made during this presentation (other than statements of historical facts) are forward-looking statements. Such forward-looking statements are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995, and include estimates and assumptions related to economic, competitive and legislative developments. These forward-looking statements are subject to change and uncertainty that are, in many instances, beyond the company’s control, and have been made based upon management’s expectations and beliefs concerning future developments and their potential effect on Harleysville Group Inc. There can be no assurance that future developments will be in accordance with management’s expectations so that the effect of future developments on Harleysville Group will be those anticipated by management. Actual financial results, including operating return on equity, premium growth and underwriting results, could differ materially from those anticipated by Harleysville Group depending on the outcome of certain factors, which may include changes in property and casualty loss trends and reserves; catastrophe losses; reduced economic activity; the insurance product pricing environment; changes in applicable law and accounting standards; government regulation and changes therein that may impede the ability to charge adequate rates or to do business; performance of and instability in the financial markets; investment losses; fluctuations in interest rates; availability and price of reinsurance; and the status of the labor markets in which the company operates.