Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Central Index Key	dei_EntityCentralIndexKey	0001342947
BBH Partner Fund - International Equity
Risk/Return:	rr_RiskReturnAbstract
Supplement to Prospectus	rr_SupplementToProspectusTextBlock	BBH TRUST ___________________________________________________________ BBH PARTNER FUND — INTERNATIONAL EQUITY CLASS I SHARES (TICKER BBHLX) ____________________________________________________________ SUPPLEMENT DATED APRIL 1, 2021 TO THE PROSPECTUS, DATED MARCH 1, 2021 The following information supplements, and to the extent inconsistent therewith, supersedes, certain information in the Prospectus. Defined terms not otherwise defined in this supplement have the same meaning as set forth in the Prospectus. ___________________________________________________________________________ • Effective immediately, the information on the cover of the Prospectus is deleted in its entirety and replaced with the following: Prospectus March 1, 2021 BBH PARTNER FUND — INTERNATIONAL EQUITY CLASS I SHARES (TICKER BBHLX) These securities have not been approved or disapproved by the U.S. Securities and Exchange Commission (“SEC”) or any state securities commission, nor has the SEC or any state securities commission passed upon the accuracy or adequacy of this prospectus. Any representation to the contrary is a criminal offense.

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Central Index Key

dei_EntityCentralIndexKey

0001342947

BBH Partner Fund - International Equity

Risk/Return:

rr_RiskReturnAbstract

Supplement to Prospectus

rr_SupplementToProspectusTextBlock

BBH TRUST

___________________________________________________________

BBH PARTNER FUND — INTERNATIONAL EQUITY

CLASS I SHARES (TICKER BBHLX)

____________________________________________________________

SUPPLEMENT DATED APRIL 1, 2021

TO THE PROSPECTUS, DATED MARCH 1, 2021

The following information supplements, and to the extent inconsistent therewith, supersedes, certain information in the Prospectus. Defined terms not otherwise defined in this supplement have the same meaning as set forth in the Prospectus.

___________________________________________________________________________

•

Effective immediately, the information on the cover of the Prospectus is deleted in its entirety and replaced with the following:

Prospectus

March 1, 2021

BBH PARTNER FUND — INTERNATIONAL EQUITY

CLASS I SHARES (TICKER BBHLX)

These securities have not been approved or disapproved by the U.S. Securities and Exchange Commission (“SEC”) or any state securities commission, nor has the SEC or any state securities commission passed upon the accuracy or adequacy of this prospectus. Any representation to the contrary is a criminal offense.