<SEC-DOCUMENT>0001476765-21-000023-index.html : 20210208
<SEC-HEADER>0001476765-21-000023.hdr.sgml : 20210208
<ACCEPTANCE-DATETIME>20210208161307
ACCESSION NUMBER:		0001476765-21-000023
CONFORMED SUBMISSION TYPE:	10-Q
PUBLIC DOCUMENT COUNT:		6
CONFORMED PERIOD OF REPORT:	20201231
FILED AS OF DATE:		20210208
DATE AS OF CHANGE:		20210208

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			GOLUB CAPITAL BDC, Inc.
		CENTRAL INDEX KEY:			0001476765
		IRS NUMBER:				471893276
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			0930

	FILING VALUES:
		FORM TYPE:		10-Q
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	814-00794
		FILM NUMBER:		21601559

	BUSINESS ADDRESS:	
		STREET 1:		200 PARK AVENUE
		STREET 2:		25TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10166
		BUSINESS PHONE:		212.750.6060

	MAIL ADDRESS:	
		STREET 1:		200 PARK AVENUE
		STREET 2:		25TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10166

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GOLUB CAPITAL INVESTMENT Corp
		DATE OF NAME CHANGE:	20170511

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Golub Capital BDC, Inc.
		DATE OF NAME CHANGE:	20100414

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Golub Capital BDC LLC
		DATE OF NAME CHANGE:	20091113
</SEC-HEADER>
<DOCUMENT>
<TYPE>10-Q
<SEQUENCE>1
<FILENAME>gbdcfy202110-qq1.htm
<DESCRIPTION>10-Q
<TEXT>
Document 1 - file: gbdcfy202110-qq1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-10.1
<SEQUENCE>2
<FILENAME>tm213863d1_ex10-2.htm
<DESCRIPTION>EX-10.1
<TEXT>
Document 2 - file: tm213863d1_ex10-2.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-10.2
<SEQUENCE>3
<FILENAME>tm213863d1_ex10.htm
<DESCRIPTION>EX-10.2
<TEXT>
Document 3 - file: tm213863d1_ex10.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.1
<SEQUENCE>4
<FILENAME>gbdcfy202110-qq1exhibit311.htm
<DESCRIPTION>EX-31.1
<TEXT>
Document 4 - file: gbdcfy202110-qq1exhibit311.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.2
<SEQUENCE>5
<FILENAME>gbdcfy202110-qq1exhibit312.htm
<DESCRIPTION>EX-31.2
<TEXT>
Document 5 - file: gbdcfy202110-qq1exhibit312.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-32.1
<SEQUENCE>6
<FILENAME>gbdcfy202110-qq1exhibit321.htm
<DESCRIPTION>EX-32.1
<TEXT>
Document 6 - file: gbdcfy202110-qq1exhibit321.htm

</DOCUMENT>
</SEC-DOCUMENT>