UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(Rule 14a-101)

INFORMATION REQUIRED IN PROXY STATEMENT

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No.    )

Filed by the Registrant  ☒                            Filed by a Party other than the Registrant  ☐

Check the appropriate box:

☐  Preliminary Proxy Statement

☐  Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☐  Definitive Proxy Statement

☒  Definitive Additional Materials

☐  Soliciting Material Pursuant to §240.14a-12

FLIR SYSTEMS, INC.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

☒	No fee required.
☐	Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.
	(1)	Title of each class of securities to which transaction applies:
	(2)	Aggregate number of securities to which transaction applies:
	(3)	Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):
	(4)	Proposed maximum aggregate value of transaction:
	(5)	Total fee paid:
☐	Fee paid previously with preliminary materials.
☐	Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.
	(1)	Amount Previously Paid:
	(2)	Form, Schedule or Registration Statement No.:
	(3)	Filing party:
	(4)	Date Filed:

*** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to Be Held on April 20, 2018 Meeting Information FLIR SYSTEMS, INC. Meeting Type: Annual Meeting For holders as of: February 23, 2018 Date: April 20, 2018 Time: 9:00 AM PDT Location: 27700 SW Parkway Avenue Wilsonville, OR 97070 You are receiving this communication because you hold FLIR Systems, Inc. shares in the above named company. 27700 SW Parkway Avenue Wilsonville, OR 97070 Attention: Heather Christiansen This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). R1.0.1.17 We encourage you to access and review all of the important information contained in the proxy materials before voting. _ 1 See the reverse side of this notice to obtain 0000351942 proxy materials and voting instructions.

Before You Vote How to Access the Proxy Materials Proxy Materials Available to VIEW or RECEIVE: 1. Notice & Proxy Statement 2. Form 10-K How to View Online: Have the information that is printed in the box marked by the arrow (located on the following page) and visit: www.proxyvote.com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET: www.proxyvote.com 2) BY TELEPHONE: 1-800-579-1639 3) BY E-MAIL*: sendmaterial@proxyvote.com * If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow (located on the following page) in the subject line. Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before April 06, 2018 to facilitate timely delivery. How To Vote Please Choose One of the Following Voting Methods R1.0.1.17 Vote In Person: Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special _ 2 requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box 0000351942 marked by the arrow available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card.

Voting items The Board of Directors recommends you vote FOR the following proposals: 1. Election of Directors Nominees 2. To ratify the appointment by the Audit 1A James J. Cannon Committee of the Company’s Board of Directors of KPMG LLP as the independent registered public accounting firm of the 1B John D. Carter Company for the fiscal year ending December 31, 2018. 1C William W. Crouch 3. To approve, on an advisory basis, the 1D Catherine A. Halligan compensation of the Company’s Named Executive Officers as disclosed in the proxy statement. 1E Earl R. Lewis NOTE: Such other business as may properly 1F Angus L. Macdonald come before the meeting or any adjournment thereof. 1G Michael T. Smith 1H Cathy A. Stauffer 1I Robert S. Tyrer . 17 1 . 1J John W. Wood, Jr. . 0 R1 1K Steven E. Wynne _ 3 0000351942

0000351942_4 R1.0.1.17