CERTIFICATION

I, Karla M. Rabusch, certify that:

1. I have reviewed this report on Form N-CSRS of Wells Fargo Master Trust on behalf of the following series: Wells Fargo Advantage C&B Large Cap Value Portfolio, Wells Fargo Advantage Diversified Large Cap Growth Portfolio, Wells Fargo Advantage Emerging Growth Portfolio, Wells Fargo Advantage Equity Value Portfolio, Wells Fargo Advantage Index Portfolio, Wells Fargo Advantage International Equity Portfolio, Wells Fargo Advantage International Growth Portfolio, Wells Fargo Advantage International Index Portfolio, Wells Fargo Advantage International Value Portfolio, Wells Fargo Advantage Large Company Value Portfolio, Wells Fargo Advantage Small Cap Value Portfolio, Wells Fargo Advantage Small Company Growth Portfolio, Wells Fargo Advantage Small Company Value Portfolio, Wells Fargo Advantage Core Bond Portfolio, Wells Fargo Advantage Inflation-Protected Bond Portfolio, Wells Fargo Advantage Managed Fixed Income Portfolio, and Wells Fargo Advantage Stable Income Portfolio;

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 officers 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 of this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal controls over financial reporting that occurred during the registrant’s most recent fiscal half-year 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 officers 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 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 controls over financial reporting.

Date: January 28, 2013

/s/ Karla M. Rabusch

Karla M. Rabusch

President

Wells Fargo Master Trust

Exhibit 99.CERT

CERTIFICATION

I, Nancy Wiser, certify that:

1. I have reviewed this report on Form N-CSRS of Wells Fargo Master Trust on behalf of the following series: Wells Fargo Advantage C&B Large Cap Value Portfolio, Wells Fargo Advantage Diversified Large Cap Growth Portfolio, Wells Fargo Advantage Emerging Growth Portfolio, Wells Fargo Advantage Equity Value Portfolio, Wells Fargo Advantage Index Portfolio, Wells Fargo Advantage Large Company Value Portfolio, Wells Fargo Advantage Small Cap Value Portfolio, Wells Fargo Advantage Small Company Growth Portfolio, Wells Fargo Advantage Small Company Value Portfolio, Wells Fargo Advantage Core Bond Portfolio, Wells Fargo Advantage Inflation-Protected Bond Portfolio, Wells Fargo Advantage Managed Fixed Income Portfolio, and Wells Fargo Advantage Stable Income Portfolio;

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 officers 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 of this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal controls over financial reporting that occurred during the registrant’s most recent fiscal half-year 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 officers 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 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 controls over financial reporting.

Date: January 28, 2013

/s/ Nancy Wiser

Nancy Wiser

Treasurer

Wells Fargo Master Trust

Exhibit 99.CERT

CERTIFICATION

I, Jeremy DePalma, certify that:

1. I have reviewed this report on Form N-CSRS of Wells Fargo Master Trust on behalf of the following series: Wells Fargo Advantage International Equity Portfolio, Wells Fargo Advantage International Growth Portfolio, Wells Fargo Advantage International Index Portfolio, and Wells Fargo Advantage International Value Portfolio;

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 officers 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 of this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal controls over financial reporting that occurred during the registrant’s most recent fiscal half-year 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 officers 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 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 controls over financial reporting.

Date: January 28, 2013

/s/ Jeremy DePalma

Jeremy DePalma

Treasurer

Wells Fargo Master Trust

Exhibit 99.CERT