UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington D.C. 20549

FORM 10-D

ASSET BACKED ISSUER
DISTRIBUTION REPORT PURSUANT TO SECTION 13 OR 15(d) OF
THE SECURITIES EXCHANGE ACT OF 1934

For the monthly distribution period from: ~~October~~November 2119, 2025 to ~~November~~December 1817, 2025

Commission File Number of issuing entity: 333-226850-09

Central Index Key Number of issuing entity: 0001864196

BBCMS Mortgage Trust 2021-C10
(Exact name of issuing entity as specified in its charter)

Commission File Number of depositor: 333-226850

Central Index Key Number of depositor: 0001541480

Barclays Commercial Mortgage Securities LLC
(Exact name of depositor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001549574

Barclays Capital Real Estate Inc.
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001755531

Societe Generale Financial Corporation
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001548405

Starwood Mortgage Capital LLC
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001685185

UBS AG
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001089877

KeyBank National Association
(Exact name of sponsor as specified in its charter)

Daniel Schmidt (212) 528-7479
(Name and telephone number, including area code, of the person to contact in connection with this filing)

New York
(State or other jurisdiction of incorporation or organization of the issuing entity)

35-7287155
38-4178152
38-4178153
(I.R.S. Employer Identification No.)

c/o Computershare Trust Company, N.A., as agent for
Wells Fargo Bank, National Association
9062 Old Annapolis Road
Columbia, MD 21045
(Address of principal executive offices of the issuing entity) (Zip Code)

(667) 786-1992
(Telephone number, including area code)

Not Applicable
(Former name, former address, if changed since last report)

Registered/reporting pursuant to (check one)

Title of Class	Section 12(b)	Section 12(g)	Section 15(d)	Name of Exchange (If Section 12(b))
A-1			X
A-2			X
A-5			X
A-SB			X
X-A			X
X-B			X
A-S			X
B			X
C			X

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes X No

Part I - DISTRIBUTION INFORMATION

Item 1. Distribution and Pool Performance Information.

On ~~November~~December 1817, 2025 a distribution was made to holders of the certificates issued by BBCMS Mortgage Trust 2021-C10.

The distribution report is attached as an Exhibit to this Form 10-D, please see Item 10(b), Exhibit 99.1 for the related information.

~~The~~No ~~following~~assets ~~table~~securitized ~~presents~~by ~~the~~Barclays ~~loss~~Commercial ~~information~~Mortgage ~~for~~Securities LLC (the ~~trust~~"Depositor") ~~assets~~and ~~for~~held ~~the~~by BBCMS Mortgage Trust 2021-C10 inwere ~~accordance~~the ~~with~~subject ~~Item~~of ~~1100(b)~~a asdemand ~~required~~to byrepurchase ~~Item~~or ~~1121(a)(9)~~replace for breach of ~~Regulation~~the ~~AB:~~representations and warranties contained in the underlying transaction documents during the monthly distribution period from November 19, 2025 to December 17, 2025.

~~Loss~~The ~~Information~~Depositor asfiled ~~reported~~its most recent Form ABS-15G in accordance with Rule 15Ga-1 under the Exchange Act (a "Rule 15Ga-1 Form ABS-15G") on November 184, 2025. The CIK number for the Depositor is 0001541480.

Number of Delinquencies 30+ days	% of Delinquencies 30+ days by Pool Balance	Number of Loans/REOs with Losses	Average Net Loss
1	1.92%	0	N/A

Barclays Capital Real Estate Inc. filed its most recent Rule 15Ga-1 Form ABS-15G on February 13, 2025. The CIK number for Barclays Capital Real Estate Inc. is 0001549574.

NoSociete ~~assets~~Generale ~~securitized~~Financial ~~by Barclays Commercial Mortgage Securities LLC~~Corporation ~~(the~~filed ~~"Depositor")~~its ~~and~~most ~~held~~recent byRule ~~BBCMS~~15Ga-1 ~~Mortgage~~Form ~~Trust 2021~~ABS-~~C10 were~~15G ~~the~~on ~~subject~~February of13, a2025. ~~demand~~The toCIK ~~repurchase~~number ~~or replace~~ for ~~breach~~Societe ofGenerale ~~the~~Financial ~~representations and warranties contained in the underlying transaction documents during the monthly distribution period from October 21, 2025~~Corporation ~~to November~~is ~~18, 2025~~0001755531.

~~The~~Starwood ~~Depositor~~Mortgage Capital LLC filed its most recent ~~Form ABS-15G in accordance with~~ Rule 15Ga-1 ~~under the Exchange Act (a "Rule 15Ga-1~~ Form ABS-15G") on ~~November~~October 431, 2025. The CIK number for ~~the~~Starwood ~~Depositor~~Mortgage Capital LLC is ~~0001541480~~0001548405.

~~Barclays~~UBS ~~Capital Real Estate Inc.~~AG filed its most recent Rule 15Ga-1 Form ABS-15G on February 1312, 2025. The CIK number for ~~Barclays~~UBS ~~Capital Real Estate Inc.~~AG is ~~0001549574~~0001685185.

~~Societe~~KeyBank ~~Generale~~National ~~Financial Corporation~~Association filed its most recent Rule 15Ga-1 Form ABS-15G on ~~February~~August 1314, 2025. The CIK number for ~~Societe~~KeyBank ~~Generale~~National ~~Financial Corporation~~Association is ~~0001755531~~0001089877.

~~Starwood~~Item ~~Mortgage~~1A. ~~Capital LLC filed its most recent Rule 15Ga~~Asset-1Level ~~Form ABS-15G on October 31, 2025~~Information. ~~The CIK number for Starwood Mortgage Capital LLC is 0001548405.~~

~~UBS~~ABS AG Asset Data File (filed ~~its~~as ~~most~~Exhibit ~~recent~~102 ~~Rule~~to ~~15Ga-1~~the registrant's Form ABS-~~15G~~EE filed on ~~February~~December 1229, 2025. under ~~The~~Commission ~~CIK~~File ~~number~~No. ~~for~~333-226850-09 ~~UBS~~and ~~AG is~~incorporated ~~0001685185~~by reference herein).

~~KeyBank~~ABS ~~National~~Asset ~~Association~~ Related Document (filed ~~its~~as ~~most~~Exhibit ~~recent~~103 ~~Rule~~to ~~15Ga-1~~the registrant's Form ABS-~~15G~~EE filed on ~~August~~December 1429, 2025. under ~~The~~Commission ~~CIK~~File ~~number~~No. ~~for~~333-226850-09 ~~KeyBank~~and ~~National~~incorporated ~~Association is~~by ~~0001089877~~reference herein).

~~Item~~Part ~~1A.~~II ~~Asset~~-~~Level~~ ~~Information.~~OTHER INFORMATION

~~ABS~~Item ~~Asset Data File (filed as Exhibit 102 to the registrant's Form ABS-EE filed on December 1, 2025 under Commission File No~~9. ~~333-226850-09~~Other ~~and incorporated by reference herein)~~Information.

~~ABS~~KeyBank ~~Asset~~National ~~Related~~Association, ~~Document~~in ~~(filed~~its capacity as ~~Exhibit~~Master ~~103~~Servicer tofor ~~the~~BBCMS ~~registrant's~~Mortgage ~~Form~~Trust ~~ABS~~2021-~~EE filed on December 1~~C10, ~~2025 under~~affirms ~~Commission~~the ~~File~~following ~~No.~~amounts ~~333-226850-09~~in ~~and~~the ~~incorporated~~respective ~~by reference herein).~~ accounts:

Part II - OTHER INFORMATION

Collection Account
Prior Distribution Date	11/18/2025	$0.00
Current Distribution Date	12/17/2025	$0.00

Item 9. Other Information.

REO Account
Prior Distribution Date	11/18/2025	$0.00
Current Distribution Date	12/17/2025	$0.00

~~KeyBank~~Computershare ~~National~~Trust ~~Association~~Company, N.A., as agent for Wells Fargo Bank, N.A., in its capacity as ~~Master~~Certificate ~~Servicer~~Administrator for BBCMS Mortgage Trust 2021-C10, affirms the following amounts in the respective accounts:

Collection Account
Distribution Account
Prior Distribution Date	1011/2018/2025	$06,231.0007
Current Distribution Date	1112/1817/2025	$06,025.0072

REO Account
Interest Reserve Account
Prior Distribution Date	1011/2018/2025	$0.00
Current Distribution Date	1112/1817/2025	$0.00

Computershare Trust Company, N.A., as agent for Wells Fargo Bank, N.A., in its capacity as Certificate Administrator for BBCMS Mortgage Trust 2021-C10, affirms the following amounts in the respective accounts:

Gain-on-Sale Reserve Account
Prior Distribution Date	11/18/2025	$0.00
Current Distribution Date	12/17/2025	$0.00

Distribution Account
Prior Distribution Date	10/20/2025	$6,034.67
Current Distribution Date	11/18/2025	$6,231.07

Item 10. Exhibits.

Interest Reserve Account
Prior Distribution Date	10/20/2025	$0.00
Current Distribution Date	11/18/2025	$0.00

(a) The following is a list of documents filed as part of this Report on Form 10-D:

Gain-on-Sale Reserve Account
Prior Distribution Date	10/20/2025	$0.00
Current Distribution Date	11/18/2025	$0.00

(99.1) Monthly report distributed to holders of the certificates issued by BBCMS Mortgage Trust 2021-C10, relating to the December 17, 2025 distribution.

~~Item~~(102) 10 ABS Asset Data File (filed as Exhibit 102 to the registrant's Form ABS-EE filed on December 29, 2025 under Commission File No. ~~Exhibits~~333-226850-09 and incorporated by reference herein).

(a103) ~~The~~ ABS ~~following~~Asset isRelated aDocument ~~list~~(filed ofas ~~documents~~Exhibit ~~filed~~103 asto ~~part~~the ofregistrant's ~~this~~Form ~~Report~~ABS-EE filed on ~~Form~~December 1029, 2025 under Commission File No. 333-D:226850-09 and incorporated by reference herein).

(~~99.1~~b) ~~Monthly~~The ~~report~~exhibits ~~distributed~~required to ~~holders~~be offiled ~~the certificates issued~~ by ~~BBCMS~~the ~~Mortgage~~Registrant ~~Trust~~pursuant ~~2021-C10, relating~~ to ~~the~~this ~~November~~Form ~~18,~~are ~~2025 distribution~~listed above.

~~(102) ABS Asset Data File (filed as Exhibit 102 to the registrant's Form ABS-EE filed on December 1, 2025 under Commission File No. 333-226850-09 and incorporated by reference herein).~~ SIGNATURES

~~(103)~~Pursuant ~~ABS~~to ~~Asset~~the ~~Related~~requirements ~~Document~~of ~~(filed~~the asSecurities ~~Exhibit~~Exchange ~~103~~Act toof 1934, the registrant's ~~Form~~has ~~ABS-EE~~duly ~~filed~~caused onthis ~~December~~report 1,to ~~2025~~be ~~under~~signed ~~Commission~~on ~~File~~its ~~No.~~behalf ~~333-226850-09~~by ~~and~~the ~~incorporated~~undersigned bythereunto ~~reference~~duly ~~herein)~~authorized.

~~(b)~~Barclays ~~The~~Commercial ~~exhibits~~Mortgage ~~required~~Securities toLLC(Depositor) ~~be filed by the Registrant pursuant to this Form are listed above.~~

~~SIGNATURES~~/s/ Daniel SchmidtDaniel Schmidt, Authorized Signatory

~~Pursuant~~Date: December ~~to the requirements of the Securities Exchange Act of 1934~~29, ~~the~~2025 ~~registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.~~

Barclays Commercial Mortgage Securities LLC(Depositor)

/s/ Daniel SchmidtDaniel Schmidt, Authorized Signatory

Date: December 1, 2025

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549

FORM 10-D

ASSET BACKED ISSUER DISTRIBUTION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Registered/reporting pursuant to (check one)

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington D.C. 20549

ASSET BACKED ISSUER
DISTRIBUTION REPORT PURSUANT TO SECTION 13 OR 15(d) OF
THE SECURITIES EXCHANGE ACT OF 1934

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