EX-99.CERT

CERTIFICATION

I, Herbert M. Allison, Jr., certify that:

1. I have reviewed this report on Form N-CSR of the TIAA-CREF Institutional Mutual Funds;
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,  changes in net assets, and cash flows (if the financial statements are required to include a  statement of 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 Rule 30a-3(c) under the  Investment Company Act of 1940) and internal control over financial reporting (as defined in  Rule 30a-3(d) under the Investment Company Act of 1940) 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)	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;
(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 a date within 90 days prior to the filing date of 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 second fiscal quarter of the period covered by this  report that has materially affected, or is 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 to the registrant's auditors and the audit committee of the 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 control 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:	May 16, 2005	By	/s/ Herbert M. Allison, Jr.
			Herbert M. Allison, Jr.
			President and Chief Executive Officer
			(principal executive officer)

EX-99.CERT

CERTIFICATION

I, Russell Noles, certify that:

1. I have reviewed this report on Form N-CSR of the TIAA-CREF Institutional Mutual Funds;
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,  changes in net assets, and cash flows (if the financial statements are required to include a  statement of 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 Rule 30a-3(c) under the  Investment Company Act of 1940) and internal control over financial reporting (as defined in  Rule 30a-3(d) under the Investment Company Act of 1940) 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)	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;
(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 a date within 90 days prior to the filing date of 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 second fiscal quarter of the period covered by this  report that has materially affected, or is 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 to the registrant's auditors and  the audit committee of the registrant's board of directors (or persons performing the equivalent  functions):

(a)	significant deficiencies and material weaknesses in the design or operation of internal control 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:	May 16, 2005	By	/s/ Russell Noles
			Russell Noles
			Vice President and Acting Chief Financial Officer,
			Teachers Insurance and Annuity Association of  America
			(acting principal financial officer)