3M CO — Director's Dealing 2010

May 13, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: 3M CO (MMM)
CIK: 0000066740
Period of Report: 2010-05-11

Reporting Person: LIDDY EDWARD M (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-05-11	Common Stock	A	60	$82.67	Acquired	28864	Indirect
2010-05-11	Common Stock	A	1750	$83.57	Acquired	30614	Indirect

Footnotes

F1: This reported transaction involves an increase in the Annual Cash Retainer portion of the non-employee director compensation, effective January 1, 2010 that was approved by the Board of Directors on May 11, 2010. The Annual Cash Retainer was increased from $85,000 to $105,000.

F2: This non-employee director has elected to defer all or a portion of compensation otherwise payable in cash or stock to a common stock equivalents account under the terms of 3M's Compensation Plan for Non-employee Directors and has no voting or investment powers with respect to such account.

F3: Includes acquisition of deferred dividend reinvestment shares pursuant to 3M's Compensation Plan for Non- Employee Directors.