Deli Serdang (Indonesian: Kabupaten Deli Serdang; Jawi: دلي سردڠ) is a regency in the Indonesian province of North Sumatra. It surrounds the city of Medan, and also borders to the west the city of Binjai, which is effectively a bedroom community for Medan. The entire regency lies within the Medan metropolitan area. It occupies an area of 2,502.16 km (966.09 sq miles). The capital of the district is Lubuk Pakam, which is located approximately 30 km east of Medan. The national census of 2000 recorded 1,573,987 people, but by 2010 the regency's population increased by 13.76% to 1,790,431, and at the 2020 Census the total was 1,931,441. The official estimate as at mid 2023 was 2,015,429. Kualanamu International Airport is located in this regency, 23 kilometres (14 mi) east of downtown Medan.

It is the most populous regency in Indonesia outside the island of Java. Its population is comparable to the country of Latvia.

The external boundaries of the regency are with:

• To the north: the Langkat Regency and the Strait of Malacca.
• To the south: the Karo Regency and Simalungun Regency.
• To the east: the Serdang Bedagai Regency and the Strait of Malacca.
• To the west: the Karo Regency, Langkat Regency and the city of Binjai.

The major city of Medan is a semi-enclave within the regency (except in the north, where the city reaches the Malacca Strait at Belawan).

The regency is divided into twenty-two districts (kecamatan), tabulated below with their areas (in km) and their 2010 Census and 2020 Census populations, and the official estimates as of mid 2023. The table also includes the locations of the district administrative centres, the number of administrative villages within each district (totaling 380 rural desa, and 14 urban kelurahan), and its post code:

Kode Wilayah	Name of District (kecamatan)	Area in km	Pop'n Census 2010	Pop'n Census 2020	Pop'n Estimate mid 2023	Admin centre	No. of desa	No. of kelu- rahan	Post code
12.07.21	Patumbak	43.79	88,961	97,994	94,580	Patumbak	8	-	20361
12.07.22	Deli Tua	9.36	60,624	59,292	61,427	Deli Tua	3	3	20355
12.07.23	Sunggal	92.52	244,187	241,359	251,348	Sunggal	17	-	20351
12.07.24	Hamparan Perak	262.88	150,054	163,521	158,884	Hamparan Perak	20	-	20374
12.07.25	Labuhan Deli	127.23	60,190	67,129	68,299	Helvetia	5	-	20373
12.07.26	Percut Sei Tuan	170.79	384,672	402,468	415,715	Tembung	18	2	20371
12.07.03	Sibolangit	173.32	19,654	19,980	21,725	Bandar Baru	30	-	20357
12.07.04	Kutalimbaru	178.81	35,870	36,238	40,221	Kutalimbaru	14	-	20354
12.07.05	Pancur Batu	122.53	84,919	93,470	99,896	Pancur Batu	25	-	20353
12.07.06	Namorambe	62.30	36,651	39,697	42,398	Namo Rambe	36	-	20356
12.07.07	Biru-Biru (or Sibiru-Biru)	89.69	34,020	39,083	40,888	Biru-Biru	17	-	20358
	Total Western half	1,333.22	1,199,802	1,260,231	1,295,381		193	5
12.07.01	Gunung Meriah	76.65	2,472	3,193	3,163	Gunung Meriah	12	-	20583
12.07.20	Sinembah Tanjung Muda Hulu	223.38	12,333	13,554	14,915	Tiga Juhar	20	-	20582
12.07.08	Sinembah Tanjung Muda Hilir	190.50	30,563	33,159	35,128	Talun Kenas	15	-	20363
12.07.09	Bangun Purba	135.33	21,550	24,375	23,711	Bangun Purba	24	-	20581
12.07.19	Galang	135.15	61,508	70,136	74,682	Galang	28	1	20585
12.07.02	Tanjung Morawa	131.75	192,759	223,450	239,718	Tanjung Morawa	25	1	20362
12.07.27	Batang Kuis	45.93	56,270	65,075	72,856	Batang Kuis	11	-	20372
12.07.32	Pantai Labu	81.85	43,135	49,167	53,627	Pantai Labu	19	-	20553
12.07.33	Beringin	54.32	52,415	60,711	66,547	Beringin	11	-	20552
12.07.28	Lubuk Pakam	31.19	80,847	88,576	93,064	Lubuk Pakam	6	7	20511 -20518
12.07.31	Pagar Merbau	62.89	36,777	39,814	42,637	Pagar Merbau	16	-	20551
	Total Eastern half	1,168.94	590,629	671,210	720,048		187	9

Notes: (a) Deli Tua, Deli Tua Barat and Deli Tua Timur. (b) Kenangan and Kenangan Baru. (c) Galang Kota. (d) Pekan Tanjung Morawa.
(e) Cemara, Lubuk Pakam I, II Lubuk Pakam Pekan, Lubuk Pakam III, Paluh Kemiri, Petapahan and Syahmad.

Deli Serdang Regency contains three plantations owned by London Sumatra (LONSUM).

On 21 June 2003, farmers and indigenous peoples in a number of villages within the district attempted to re-occupy lands which had been leased to LONSUM by the government. Police fired upon the group, resulting in at least a dozen wounded and four deaths.

Channel	Signal	Frequency	Name	Network	Company name	Owner	Status
23	487.250-MHz	UHF	Indosiar		PT Indosiar Visual Mandiri	Elang Mahkota Teknologi	Nasional
25	503.250-MHz		MNCTV		PT Cipta Televisi Pendidikan Indonesia	Media Nusantara Citra
27	519.250-MHz		Trans TV		PT Televisi Transformasi Indonesia	Trans Media
29	535.250-MHz		ANTV		PT Cakrawala Andalas Televisi	Visi Media Asia
31	551.250-MHz		GTV		PT Global Informasi Bermutu	Media Nusantara Citra
33	567.250-MHz		RCTI		PT Rajawali Citra Televisi Indonesia	Media Nusantara Citra
35	583.250-MHz		SCTV		PT Surya Citra Televisi	Elang Mahkota Teknologi
37	599.250-MHz		tvOne		PT Lativi Media Karya	Visi Media Asia
39	615.250-MHz		Metro TV		PT Media Televisi Indonesia	Media Group
41	631.250-MHz		Trans7		PT Duta Visual Nusantara Tivi Tujuh	Trans Media
43	647.250-MHz		NET.		PT Net Mediatama Indonesia	Indika Group
45	663.250-MHz		iNews		PT Deli Media Televisi	Media Nusantara Citra
47	679.250-MHz		TVRI Nasional	TVRI	Lembaga Penyiaran Publik TVRI	Pemerintah Indonesia
			TVRI Sumatra Utara			Pemeritah Sumatra Utara	Lokal
49	695.250-MHz		DAAI TV		PT Daya Angkasa Andalas Indah Televisi	Tau Chi Media	Berjaringan
51	751.250-MHz		BeritaSatu		PT First Media News	Media Holdings Group
50	703.250-MHz		TVRI Nasional	TVRI	Lembaga Penyiaran Publik TVRI	Pemerintah Indonesia	Nasional
53	727.250-MHz		RTV		PT Cahaya Nusantara Perkasa Televisi	Rajawali Corpora	Nasional
54	735.250-MHz		Efarina TV		PT Efarina Televisi	Efarina Etham
55	737.250-MHz		MYTV		PT Banten Media Global Televisi	Netwave Group dan Mayapada Group
57	739.250-MHz		Info TV		PT Info Mayapada	Mayapada Group
59	775.250-MHz		Kompas TV		PT Gramedia Media Nusantara	Kompas Gramedia

• Sultanate of Deli
• Sultanate of Serdang

3°33′N 98°51′E / 3.550°N 98.850°E / 3.550; 98.850