Certification Pursuant to Rule 30a-2(b) under the 1940 Act and Section 906 of the

Sarbanes-Oxley Act

I, Stephen J. Kneeley, President of Driehaus Mutual Funds (the “Registrant”), certify that:

1. The Form N-CSR of the Registrant (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Date: March 4, 2019	/s/Stephen J. Kneeley
	Stephen J. Kneeley, President
	(principal executive officer)

I, Robert M. Kurinsky, Vice President and Treasurer of Driehaus Mutual Funds (the “Registrant”), certify that:

1. The Form N-CSR of the Registrant (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Date: March 4, 2019	/s/Robert M. Kurinsky
	Robert M. Kurinsky, Vice President and Treasurer
	(principal financial officer)