{{Infobox Holiday|holiday_name=Hari Lajang|observedby=[[Tiongkok]]|type=Komersial|significance=Hari berbelanja terbesar di dunia|celebrations=Berbelanja, festival, klub/kedai|frequency=Tahunan|duration=1 hari|date=11 November|scheduling=Di hari yang sama setiap tahun|caption=Sebuah ilustrasi untuk penjualan perbelanjaan onlinedaring di liburan Hari Lajang|image=Singles' day illustration.png}}
'''Hari Lajang''' ({{zh|s=光棍节|t=光棍節}}) atau '''Double 11''' ({{zh|s=双11}}), mulanya disebut '''Hari Bujang''', adalah sebuah liburan tidak resmi di [[Republik Rakyat Tiongkok|Tiongkok]] dan musim belanja yang dirayakan oleh orang-orang yang tidak menjalin hubungan. Harinya, 11 November (11/11), dipilih karena angka 1 menyerupai tongkat telanjang ({{zh|s=光棍|p=guānggùn}}), yang mana dalam Bahasa gaul Internet Tiongkok untuk lelaki yang belum menikah tidak ingin menambahkan "ranting" dalam [[silsilah]].
Awalnya, tanggal itu dirayakan sebagai tanggapan sinis terhadap festival tradisional yang berpusat pada pasangan oleh sekelompok kecil sarjana perguruan tinggi. Namun, pada tahun 2009 CEO Alibaba [[Daniel Zhang]] mulai menggunakan hari itu sebagai festival belanja 24 jam yang menawarkan diskon belanja onlinedaring dan hiburan offlineluring.<ref>{{Cite web|date=2021-11-12|title=Singles' Day posts a record haul even at the slowest pace in a decade|url=https://www.scmp.com/tech/big-tech/article/3155762/sales-growth-alibabas-singles-day-drops-amid-chinas-crackdown-big|website=South China Morning Post|language=en|access-date=2021-11-17|archive-date=2022-11-29|archive-url=https://web.archive.org/web/20221129005845/https://www.scmp.com/tech/big-tech/article/3155762/sales-growth-alibabas-singles-day-drops-amid-chinas-crackdown-big|dead-url=no}}</ref><ref>{{Cite news|last=Huy|first=Quy|date=2019-12-11|title=For Alibaba, Singles Day Is About More Than Huge Sales|url=https://hbr.org/2019/12/for-alibaba-singles-day-is-about-more-than-huge-sales|work=Harvard Business Review|issn=0017-8012|access-date=2021-11-17|archive-date=2023-06-01|archive-url=https://web.archive.org/web/20230601001709/https://hbr.org/2019/12/for-alibaba-singles-day-is-about-more-than-huge-sales|dead-url=no}}</ref><ref>{{Cite web|title=How Alibaba made Singles' Day the world's largest shopping festival|url=https://fortune.com/2018/11/09/alibaba-singles-day-china/|website=Fortune|language=en|access-date=2021-11-17|archive-date=2023-02-02|archive-url=https://web.archive.org/web/20230202193925/https://fortune.com/2018/11/09/alibaba-singles-day-china/|dead-url=no}}</ref> Hari libur tersebut kini menjadi hari retail fisik dan belanja [[Belanjabelanja daring|online]] terbesar di dunia. Saingan Alibaba, seperti [[JD.com]] menyelenggarakan festival Hari Lajang juga, yang mengumpulkan AS$19,1 miliar, sehingga total volume penjualan Tiongkok menjadi AS$44,5 miliar pada tahun 2017.<ref>{{Cite news|date=26 July 2018|title=Singles Day 2017 Breaks Record with $44.5 Billion in Sales|url=https://singlesdaybest.com/index.php/2018/07/26/singles-day-2017-breaks-record-with-44-billion-in-sales/|work=SinglesDayBest.com|language=en-US|access-date=15 September 2018|archive-date=2019-05-09|archive-url=https://web.archive.org/web/20190509175123/https://singlesdaybest.com/index.php/2018/07/26/singles-day-2017-breaks-record-with-44-billion-in-sales/|dead-url=yes}}</ref> Pembeli [[Alibaba Group|Alibaba]] melebihi total pembelanjaan 213,5 miliar [[yuan]] ([[Dolar Amerika Serikat|AS$]]30,7 miliar) selama Hari Jomblo 2018.<ref>{{Cite news|last=Haas|first=Benjamin|date=12 November 2017|title=Chinese shoppers spend a record $25bn in Singles Day splurge|url=https://www.theguardian.com/world/2017/nov/12/chinese-shoppers-spend-a-record-25bn-in-singles-day-splurge|work=The Guardian|issn=0261-3077|access-date=10 January 2018|archive-date=2019-07-16|archive-url=https://web.archive.org/web/20190716053731/https://www.theguardian.com/world/2017/nov/12/chinese-shoppers-spend-a-record-25bn-in-singles-day-splurge|dead-url=no}}</ref><ref name="C. Custer">{{Cite web|last=C. Custer|date=14 October 2014|title=Tmall CEO: this year, Alibaba plans to take Singles Day global|url=https://www.techinasia.com/tmall-ceo-year-alibaba-plans-singles-day-global/|website=Tech in Asia|access-date=21 October 2014|archive-date=2019-06-30|archive-url=https://web.archive.org/web/20190630164334/https://www.techinasia.com/tmall-ceo-year-alibaba-plans-singles-day-global|dead-url=no}}</ref> Pada tahun 2019, Alibaba mengatakan bahwa volume barang dagangan kotornya untuk seluruh acara mencapai 268,4 miliar yuan (AS$38,4 miliar), meningkat 26% dari tahun sebelumnya.<ref name="Reuters Alibabas Singles Day 2019" /> Pada tahun 2021, Alibaba dan JD mencapai total rekor penjualan Hari Lajang baru sebesar AS$139 miliar.<ref>{{Cite web|last=Kharpal|first=Arjun|date=2021-11-12|title=Alibaba, JD smash Singles Day record with $139 billion of sales and focus on 'social responsibility'|url=https://www.cnbc.com/2021/11/12/china-singles-day-2021-alibaba-jd-hit-record-139-billion-of-sales.html|website=CNBC|language=en|access-date=2021-11-16|archive-date=2023-07-12|archive-url=https://web.archive.org/web/20230712182507/https://www.cnbc.com/2021/11/12/china-singles-day-2021-alibaba-jd-hit-record-139-billion-of-sales.html|dead-url=no}}</ref>
