-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 FL2wSfEd67YRTRiwbgcUwWUSQKSNNxhL0pq7OZX6jODip3CPrbcMdOBjwKrDMtqU
 +7OrqeMlfKIYkNGnjNqCnw==

<SEC-DOCUMENT>9999999995-10-003047.txt : 20101027
<SEC-HEADER>9999999995-10-003047.hdr.sgml : 20101027
<ACCEPTANCE-DATETIME>20101027001519
ACCESSION NUMBER:		9999999995-10-003047
CONFORMED SUBMISSION TYPE:	EFFECT
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20101026
DATE AS OF CHANGE:		20101027
EFFECTIVENESS DATE:		20101026

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Guggenheim Build America Bonds Managed Duration Trust
		CENTRAL INDEX KEY:			0001495825
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE

	FILING VALUES:
		FORM TYPE:		EFFECT
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-168042
		FILM NUMBER:		101143413

	BUSINESS ADDRESS:	
		STREET 1:		2455 CORPORATE WEST DRIVE
		CITY:			LISLE
		STATE:			IL
		ZIP:			60532
		BUSINESS PHONE:		630-505-3700

	MAIL ADDRESS:	
		STREET 1:		2455 CORPORATE WEST DRIVE
		CITY:			LISLE
		STATE:			IL
		ZIP:			60532
</SEC-HEADER>
<DOCUMENT>
<TYPE>EFFECT
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0101</schemaVersion>

    <submissionType>EFFECT</submissionType>

    <act>33</act>

    <testOrLive>LIVE</testOrLive>

    <effectiveData>
        <finalEffectivenessDispDate>2010-10-26</finalEffectivenessDispDate>
        <finalEffectivenessDispTime>16:45:00</finalEffectivenessDispTime>
        <form>N-2</form>
        <filer>
            <cik>0001495825</cik>
            <entityName>Guggenheim Build America Bonds Managed Duration Trust</entityName>
            <fileNumber>333-168042</fileNumber>
        </filer>
    </effectiveData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----