EXHIBIT 15
April 30, 2015
Securities and Exchange Commission
100 F Street, NE
Washington, D.C. 20549
Commissioners:
We are aware that our report dated April 30, 2015 on our review of interim financial information of 3M Company and its subsidiaries for the three month periods ended March 31, 2015 and 2014 and included in the Companys quarterly report on Form 10-Q for the quarter ended March 31, 2015 is incorporated by reference in its Registration Statements on Form S-8 (Registration Nos. 333-30689, 333-30691, 333-44760, 333-73192, 333-101727, 333-101751, 333-109282, 333-128251, 333-130150, 333-151039, 333-156626, 333-156627, 333-166908, 333-174562, 333-181269, and 333-181270) and Form S-3 (Registration Nos. 33-48089, 333-42660, and 333-109211, and 333-196003).
Very truly yours,
/s/ PricewaterhouseCoopers LLP
PricewaterhouseCoopers LLP
Minneapolis, Minnesota