Exhibit (24)

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that the undersigned directors and officers of S&T Bancorp, Inc., a corporation organized under the laws of the Commonwealth of Pennsylvania (the “Corporation”), hereby constitute and appoint Robert E. Rout and Wendy Bell, and each of them (with full power to each of them to act alone) his or her true and lawful attorneys-in-fact and agents with full power of substitution and resubstitution, for him or her and on his or her behalf and in his or her name, place and stead, in any and all capacities, to sign, execute and to affix his or her seal to and file with the Securities and Exchange Commission (or any other governmental or regulatory authority) this Registration Statement on Form S-3, and any and all amendments (including post-effective amendments) thereto, with all exhibits and any and all documents required to be filed with respect thereto, relating to the registration under the Securities Act of 1933, as amended, and any applicable securities exchange or securities self-regulatory organization, hereby granting to such attorneys-in-fact and agents, each acting alone, the full power and authority to do and perform every act and thing requisite, necessary or advisable to be done in connection with such signing and filing, as fully and to all intents and purposes as any such officer or director might or could do in person; and such persons are authorized to take or cause to be taken any and all such further actions in connection therewith in the name and on behalf of the Corporation as they, in their sole discretion, deem necessary or appropriate; and each of the undersigned hereby ratifies and confirms all that any said attorney-in-fact and agent, or any substitute, lawfully does or causes to be done by virtue hereof.

IN WITNESS WHEREOF, each of the undersigned has, with full power of substitution and resubstitution, hereunto set his or her hand as of the date specified.

Signature		Title		Date
Principal Officers:
/s/ Todd D. Brice Todd D. Brice		President and Chief Executive Officer (Principal Executive Officer) and Director		Date: August 6, 2009
/s/ Robert E. Rout Robert E. Rout		Senior Executive Vice President, Chief Financial Officer and Secretary (Principal Financial and Accounting Officer)		Date: August 6, 2009
/s/ James C. Miller James C. Miller		Chairman of the Board		Date: August 6, 2009

Directors:
/s/ John N. Brenzia John N. Brenzia		Director		Date: August 6, 2009
/s/ Thomas A. Brice Thomas A. Brice		Director		Date: August 6, 2009
/s/ John J. Delaney John J. Delaney		Director		Date: August 11, 2009
/s/ Michael J. Donnelly Michael J. Donnelly		Director		Date: August 11, 2009
William J. Gatti		Director		Date:
/s/ Jeffrey D. Grube Jeffrey D. Grube		Director		Date: August 6, 2009
Frank W. Jones		Director		Date:
/s/ Joseph A. Kirk Joseph A. Kirk		Director		Date: August 6, 2009
/s/ David L. Krieger David L. Krieger		Director		Date: August 14, 2009
/s/ James V. Milano James V. Milano		Director		Date: August 6, 2009
Christine J. Olson		Director		Date:
/s/ Alan Papernick Alan Papernick		Director		Date: August 14, 2009

Directors:
/s/ Robert Rebich Robert Rebich		Director		Date: August 6, 2009
Charles A. Spadafora		Director		Date:
Charles G. Urtin		Director		Date: