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. 333-222365) pertaining to Novavax Inc. common stock, |
| (2) | Registration Statement (Form S-3 No. 333-215389) pertaining to Novavax Inc. common stock, |
| (3) | Registration Statement (Form S-8 No. 333-219829) pertaining to the Novavax Inc. stock incentive plan, |
| (4) | Registration Statement (Form S-8 No. 333-213069) pertaining to the Novavax Inc. stock incentive plan and 2013 employee stock
purchase plan, |
| (5) | Registration Statement (Form S-8 No. 333-206354) pertaining to the Novavax Inc. stock incentive plan, |
| (6) | Registration Statement (Form S-8 No. 333-198121) pertaining to the Novavax Inc. stock incentive plan, |
| (7) | Registration Statement (Form S-8 No. 333-190600) pertaining to the Novavax Inc. stock incentive plan, |
| (8) | Registration Statement (Form S-8 No. 333-190599) pertaining to the Novavax Inc. 2013 employee stock purchase plan, |
| (9) | Registration Statement (Form S-8 No. 333-183113) pertaining to the Novavax Inc. stock incentive plan, |
| (10) | Registration Statement (Form S-8 No. 333-145298) pertaining to the Novavax Inc. stock incentive plan, |
| (11) | Registration Statement (Form S-8 No. 333-130990) pertaining to the Novavax Inc. stock incentive plan, |
| (12) | Registration Statement (Form S-8 No. 333-110401) pertaining to the Novavax Inc. stock incentive plan, |
| (13) | Registration Statement (Form S-8 No. 333-97931) pertaining to the Novavax Inc. stock incentive plan, |
| (14) | Registration Statement (Form S-8 No. 333-46000) pertaining to the Novavax Inc. stock incentive plan, |
| (15) | Registration Statement (Form S-8 No. 333-77611) pertaining to the Novavax Inc. stock incentive plan, |
| (16) | Registration Statement (Form S-8 No. 33-80279) pertaining to the Novavax Inc. stock incentive plan, and |
| (17) | Registration Statement (Form S-8 No. 33-80277) pertaining to Novavax Inc. stock incentive plan |
of our reports dated March 14, 2018, with respect to the consolidated
financial statements of Novavax Inc., and the effectiveness of internal control over financial reporting of Novavax, Inc., included
in this Annual Report (Form 10-K) of Novavax Inc. for the year ended December 31, 2017.
/s/ Ernst & Young LLP
Baltimore, Maryland
March 14, 2018