Exhibit EX-99.CERT

I, Christine Reynolds, certify that:

1. 	I have reviewed this report on Form N-CSR of Fidelity Concord Street Trust:Fidelity U.S. Bond Index Fund;

2. 	Based on my knowledge, this report does not contain any untrue statement of amaterial fact or omit to state a material fact necessary to make the statementsmade, in light of the circumstances under which such statements were made, notmisleading with respect to the period covered by this report;

3. 	Based on my knowledge, the financial statements, and other financial informationincluded in this report, fairly present in all material respects the financialcondition, results of operations, changes in net assets, and cash flows (if thefinancial statements are required to include a statement of cash flows) of theregistrant as of, and for, the periods presented in this report;

4.	The registrant's other certifying officer(s) and I are responsible for establishingand maintaining disclosure controls and procedures (as defined in Rule 30a-3(c)under the Investment Company Act of 1940) and internal control over financialreporting (as defined in Rule 30a-3(d) under the Investment Company Act of1940) for the registrant and have:

a.	Designed such disclosure controls and procedures, or caused such disclosurecontrols and procedures to be designed under our supervision, to ensure thatmaterial information relating to the registrant, including its consolidatedsubsidiaries, 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 suchinternal control over financial reporting to be designed under oursupervision, to provide reasonable assurance regarding the reliability offinancial reporting and the preparation of financial statements for externalpurposes in accordance with generally accepted accounting principles;

c.	Evaluated the effectiveness of the registrant's disclosure controls andprocedures and presented in this report our conclusions about theeffectiveness of the disclosure controls and procedures, as of a date within90 days prior to the filing date of this report based upon such evaluation;and

d.	Disclosed in this report any change in the registrant's internal control overfinancial reporting that occurred during the second fiscal quarter of theperiod covered by this report that has materially affected, or is reasonablylikely to materially affect, the registrant's internal control over financialreporting; and

5.	The registrant's other certifying officer(s) and I have disclosed to the registrant'sauditors and the audit committee of the registrant's board of directors (or personsperforming the equivalent functions):

a.	All significant deficiencies and material weaknesses in the design oroperation of internal control over financial reporting which are reasonablylikely 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 otheremployees who have a significant role in the registrant's internal controlover financial reporting.

Date: 	October 25, 2006

I, Joseph B. Hollis, certify that:

1. 	I have reviewed this report on Form N-CSR of Fidelity Concord Street Trust:Fidelity U.S. Bond Index Fund;

2. 	Based on my knowledge, this report does not contain any untrue statement of amaterial fact or omit to state a material fact necessary to make the statementsmade, in light of the circumstances under which such statements were made, notmisleading with respect to the period covered by this report;

3. 	Based on my knowledge, the financial statements, and other financial informationincluded in this report, fairly present in all material respects the financialcondition, results of operations, changes in net assets, and cash flows (if thefinancial statements are required to include a statement of cash flows) of theregistrant as of, and for, the periods presented in this report;

4.	The registrant's other certifying officer(s) and I are responsible for establishingand maintaining disclosure controls and procedures (as defined in Rule 30a-3(c)under the Investment Company Act of 1940) and internal control over financialreporting (as defined in Rule 30a-3(d) under the Investment Company Act of1940) for the registrant and have:

a.	Designed such disclosure controls and procedures, or caused such disclosurecontrols and procedures to be designed under our supervision, to ensure thatmaterial information relating to the registrant, including its consolidatedsubsidiaries, 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 suchinternal control over financial reporting to be designed under oursupervision, to provide reasonable assurance regarding the reliability offinancial reporting and the preparation of financial statements for externalpurposes in accordance with generally accepted accounting principles;

c.	Evaluated the effectiveness of the registrant's disclosure controls andprocedures and presented in this report our conclusions about theeffectiveness of the disclosure controls and procedures, as of a date within90 days prior to the filing date of this report based upon such evaluation;and

d.	Disclosed in this report any change in the registrant's internal control overfinancial reporting that occurred during the second fiscal quarter of  theperiod covered by this report that has materially affected, or is reasonablylikely to materially affect, the registrant's internal control over financialreporting; and

5.	The registrant's other certifying officer(s) and I have disclosed to the registrant'sauditors and the audit committee of the registrant's board of directors (or personsperforming the equivalent functions):

a.	All significant deficiencies and material weaknesses in the design oroperation of internal control over financial reporting which are reasonablylikely 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 otheremployees who have a significant role in the registrant's internal controlover financial reporting.

Date: 	October 25, 2006