787 Seventh Avenue New York, NY 10019-6099 Tel: 212 728 8000 Fax: 212 728 8111

October 12, 2018

VIA EDGAR

Securities and Exchange Commission

100 F Street, NE

Washington, DC 20549

Re: BlackRock EuroFund

(File No. 033-4026 and File No. 811-4612)

Ladies and Gentlemen:

On behalf of BlackRock EuroFund (the “Fund”) and pursuant to Rule 497(e) under the Securities Act of 1933, as amended, attached for filing are exhibits containing interactive data format risk/return summary information that mirrors the risk/return summary information in a supplement, dated September 24, 2018, to the Prospectuses, dated October 27, 2017 and January 25, 2018, for the Fund. The purpose of the filing is to submit the 497(e) filing dated September 24, 2018 in XBRL for the Fund.

Any questions or comments on this filing should be directed to the undersigned at (212) 728-8955.

Very truly yours,

/s/ Bissie K. Bonner

Bissie K. Bonner

Enclosures

cc: Benjamin Archibald, Esq., BlackRock Advisors, LLC

Elliot J. Gluck, Esq., Willkie Farr & Gallagher LLP