Exhibit 12.1

Certification by the Chief Executive Officer Pursuant to

Section 302 of the Sarbanes-Oxley Act of 2002

I, Wallace C. Kou, certify that:

1. I have
reviewed this annual report on Form 20-F of Silicon Motion Technology Corporation;

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 company as of, and for, the periods presented in this report;

4. The company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)) and internal control over financial reporting (as defined in Exchange Act Rules
13a-15(f) and 15d-15(f)) for the company 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 company, 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 companys disclosure controls and procedures and presented in this 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 companys internal control over financial reporting that occurred during the period
covered by the annual report that has materially affected, or is reasonably likely to materially affect, the companys internal control over financial reporting; and

5. The companys other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial
reporting, to the companys auditors and the audit committee of company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 company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 companys internal control over financial reporting.

Date: April 28, 2017



/s/ Wallace C. KouName:

Wallace C. KouTitle:

Chief Executive Officer