Exhibit 31.1

                           SECTION 302 CERTIFICATION

I, Mark A. Smith, certify that:

1.   I have reviewed this quarterly report on Form 10-Q of Bion Environmental
Technologies, Inc.;

2.   Based on my knowledge, this report does not contain any untrue statement
of a material fact or omit to state a material fact necessary to make the
statements made, in light of the circumstances under which such statements
were made, not misleading with respect to the period covered by this report;

3.   Based on my knowledge, the financial statements, and other financial
information included in this quarterly report, fairly present in all material
respects the financial condition, results of operations and cash flows of the
of the registrant as of, and for, the periods presented in this report;

4.   I am responsible for establishing and maintaining disclosure controls
and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and
internal control over financial reporting (as defined in the Exchange Act
Rules 13a-15(f) and 15d-15(f) for the registrant and have:

     (a)  Designed such disclosure controls and procedures or caused such
disclosure controls and procedures to be designed under my supervision, to
ensure that material information relating to the registrant, including its
consolidated subsidiaries, is made known to me by others within those
entities, particularly during the period in which this report is being
prepared;

     (b)  Designed such internal control over financial reporting, or caused
such internal control over financial reporting to be designed under my
supervision, to provide reasonable assurance regarding the reliability of
financial reporting and the preparation of financial statements for external
purposes in accordance with generally accepted accounting principles;

     (c)  Evaluated the effectiveness of the registrant's disclosure controls
and procedures and presented in this report my conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of the
period covered by this report based on such evaluation; and

     (d)  Disclosed in this report any change in the registrant's internal
control over financial reporting that occurred during the registrant's most
recent fiscal quarter (the registrant's fourth fiscal quarter in the case of
an annual report) that has materially affected, or is reasonably likely to
materially affect, the registrant's internal control over financial
reporting; and

5.   I have disclosed, based on my most recent evaluation of internal control
over financial reporting, to the registrant's auditors and the audit
committee of the registrant's board of directors (or persons performing the
equivalent functions):

     (a)  All significant deficiencies and material weaknesses in the design
or operation of internal control over financial reporting which are
reasonably likely to adversely affect the registrant's ability to record,
process, summarize and report financial information; and

     (b)  Any fraud, whether or not material, that involves management or
other employees who have a significant role in the registrant's internal
control over financial reporting.

Date: May 5, 2010


/s/ Mark A. Smith
Mark A. Smith
Chief Executive Officer and
Principal Financial Officer