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We hereby consent to the incorporation by reference in the Registration Statement on Forms S-8 (Nos. 333-190498, 333-127450, 333-116151, 333-148114, 333-157633, 333-165105, 333-172370, 333-207251, 333-219840 and 333-226533) and Form S-3 (No. 333-217688) of Alnylam Pharmaceuticals, Inc. of our report dated February 13, 2020 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.