Exhibit 15
May 16, 2014
Securities and Exchange Commission
100 F Street, N.E.
Washington, DC 20549
Commissioners:
We are aware that our report dated May 1, 2014 on our review of interim financial information of 3M Company for the three month periods ended March 31, 2014 and 2013 and included in the Companys quarterly report on Form 10-Q for the quarter ended March 31, 2014 is incorporated by reference in its Registration Statement on Form S-3 dated May 16, 2014.
Very truly yours,
/s/ PricewaterhouseCoopers LLP
PricewaterhouseCoopers LLP
Minneapolis, Minnesota