Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Lewis Richard Brent
 2. Date of Event Requiring Statement (Month/Day/Year)
09/22/2017		 3. Issuer Name and Ticker or Trading Symbol
DONALDSON CO INC [DCI]
(Last)
(First)
(Middle)
1400 WEST 94TH STREET		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Vice President
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

BLOOMINGTON, MN 55431-2303		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 2,000
D
 
Common Stock 2,575
I
By Benefit Plan Trust
Common Stock 343
I
By Benefit Plan Trust

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option (right to buy) 01/15/2009(1) 01/15/2019 Common Stock 2,000 $ 15.87 D  
Employee Stock Option (right to buy) 01/14/2010(1) 01/14/2020 Common Stock 4,000 $ 21.14 D  
Employee Stock Option (right to buy) 12/10/2010(1) 12/10/2020 Common Stock 3,000 $ 29.07 D  
Employee Stock Option (right to buy) 12/09/2011(1) 12/09/2021 Common Stock 4,000 $ 34.88 D  
Employee Stock Option (right to buy) 12/07/2012(1) 12/07/2022 Common Stock 3,500 $ 33.58 D  
Employee Stock Option (right to buy) 12/06/2013(1) 12/06/2023 Common Stock 3,000 $ 42.05 D  
Employee Stock Option (right to buy) 12/05/2014(1) 12/05/2024 Common Stock 3,000 $ 38.78 D  
Employee Stock Option (right to buy) 06/30/2015(1) 06/30/2025 Common Stock 10,000 $ 35.8 D  
Employee Stock Option (right to buy) 12/17/2015(1) 12/17/2025 Common Stock 13,500 $ 28 D  
Employee Stock Option (right to buy) 12/16/2016(1) 12/16/2026 Common Stock 12,000 $ 42.72 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Lewis Richard Brent
1400 WEST 94TH STREET
BLOOMINGTON, MN 55431-2303		       Vice President  

Signatures

Amy C. Becker, Attorney-in-Fact for Richard B. Lewis 10/02/2017
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The option vests in three equal annual installments commencing one year from grant date.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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