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Exhibit 31.1

Quintiles Transnational Corp. and Subsidiaries
Certification Pursuant To
Section 302 of the Sarbanes-Oxley Act of 2002

I, Dennis B. Gillings, Ph.D., certify that:



| | 1. |  | I have reviewed this quarterly report on Form 10-Q of Quintiles
Transnational Corp.;                                                                                                                                                                                                                      
| | -- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
| | 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 the 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(s) 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))
for the registrant and have:                                                                            

|   |  |                                                                                                                                                                                                                                                                                                                                                                               
|-- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|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;
|   |  |                                                                                                                                                                                                                                                                                                                                                                               
|b. |  | [Paragraph omitted pursuant to SEC Release Nos. 33-8238
and 34-47986.]                                                                                                                                                                                                                                                                                                        
|   |  |                                                                                                                                                                                                                                                                                                                                                                               
|c. |  | Evaluated the effectiveness of the registrants
disclosure controls and procedures and presented in this quarterly
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                                                                                 
|   |  |                                                                                                                                                                                                                                                                                                                                                                               
|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                                                                                               





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Quintiles Transnational Corp. and Subsidiaries

| |  |                                                                                                        
| |  | -------------------------------------------------------------------------------------------------------
| |  | reasonably likely to materially affect, the registrants internal
control over financial reporting; and



| | 5. |  | The registrants other certifying officer(s) 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):
| | -- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|   |  |                                                                                                                                                                                                                                                                           
|-- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|a. |  | All significant deficiencies and material weaknesses in
the design or operation of internal controls 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: |  | November 14, 2003 |  |                                                                                                       
|      |  |                   |  |                                                                                                       
|      |  |                   |  | /s/ Dennis B.
Gillings                                                                                
|      |  |                   |  | Dennis B. Gillings, Ph.D.
Executive Chairman and Chief Executive Officer
(Principal Executive Officer)