Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements:          

(1) Registration Statement (Form S-3 No. 333-200686) of Tandem Diabetes Care, Inc.,

(2) Registration Statement (Form S-8 No. 333-192406) pertaining to the 2006 Stock Incentive Plan, 2013 Stock Incentive Plan, and 2013 Employee Stock Purchase Plan of Tandem Diabetes Care Inc., and

(3) Registration Statement (Form S-8 No. 333-202254) pertaining to the 2013 Stock Incentive Plan and 2013 Employee Stock Purchase Plan of Tandem Diabetes Care, Inc.;

of our report dated February 24, 2016, with respect to the financial statements of Tandem Diabetes Care, Inc. included in this Annual Report (Form 10-K) of Tandem Diabetes Care, Inc. for the year ended December 31, 2015.

/s/ Ernst & Young LLP

San Diego, California

February 24 , 2016