Teslić (Serbian Cyrillic: Теслић) is a town and municipality in Republika Srpska, Bosnia and Herzegovina. It is situated in the central part of Republika Srpska, on the banks of the Usora River. As of 2013, the town has a population of 7,518 inhabitants, while the municipality has 38,536 inhabitants.

About 5 km (3.1 mi) to the southeast of the town center is the location of the medieval tombstones of Duke Momčilo. Also, Solila is located on the Borja Mountain.

The town was settled in the 19th century during the first industrialization of Bosnia and Herzegovina. The main industries were the wood and chemical industry. Long before Teslić began to grow, a nearby village called Čečava existed as one of the oldest places people had inhabited. There is archaeological evidence that Čečava existed as early as the 10th century.

From 1929 to 1941, Teslić was part of the Vrbas Banovina of the Kingdom of Yugoslavia.

Teslić was until the late 1950s among the largest industrial centers in Bosnia and Herzegovina. Today Teslić's industry is mostly based on the production of wood, milk, clothing, telecommunications, the electrical industry, metal industry and construction.

Teslić is also known as a tourist destination, mainly because of the Banja Vrućica, а health spa for healing cardiovascular diseases. With a complex of five hotels and a capacity of over 1000 beds, Banja Vrućica has the biggest tourist capacity in Bosnia and Herzegovina. The nearby mountain Borja is an attractive tourist destination with two hotels and sports facilities.

According to the 2013 census results, the municipality of Teslić has a population of 38,536 inhabitants.

Population of settlements – Teslić municipality
	Settlement	1938.	1953.	1961.	1971.	1981.	1991.	2013.
	Total	35,933	39,764		52,713	60,434	59,854	38,536
1	Banja Vrućica						2,637	2,181
2	Bardaci						653	288
3	Barići						1,151	1,350
4	Bijelo Bučje						1,642	483
5	Blatnica						2,890	1,231
6	Buletić						2,419	1,588
7	Čečava						2,616	1,581
8	Donji Očauš						328	257
9	Donji Ranković						963	910
10	Donji Ružević						2,060	1,310
11	Đulići						1,512	2,086
12	Gomjenica						970	582
13	Gornja Radnja						1,033	530
14	Gornja Vrućica						1,590	387
15	Gornje Liplje						698	475
16	Gornji Očauš						959	526
17	Gornji Ranković						1,249	754
18	Gornji Ružević						661	469
19	Gornji Teslić						1,489	1,885
20	Jasenova						662	216
21	Kamenica						1,667	1,300
22	Mladikovine						2,406	1,435
23	Osivica						1,214	607
24	Pribinić						1,996	1,298
25	Radešići						489	231
26	Rajševa						763	356
27	Rastuša						1,266	592
28	Rudo Polje						543	740
29	Šnjegotina Gornja						909	538
30	Stenjak						1,740	1,071
31	Teslić			3,803	4,874	6,660	8,655	7,518
32	Ugodnovići						927	448
33	Ukrinica						1,159	649
34	Vitkovci						1,307	786
35	Vlajići						839	329
36	Žarkovina						486	313

Ethnic composition – Teslić town
Nationality	2013.	1991.	1981.	1971.
Total	7,518 (100,0%)	8,655 (100,0%)	6,660 (100,0%)	4,874 (100,0%)
Serbs		3,571 (41,26%)	2,465 (37,01%)	1,951 (40,03%)
Yugoslavs		1,987 (22,96%)	1,557 (23,38%)	69 (1,416%)
Bosniaks		1,889 (21,83%)	1 568 (23,54%)	1,595 (32,72%)
Croats		766 (8,850%)	954 (14,32%)	1,103 (22,63%)
Others		442 (5,107%)	57 (0,856%)	102 (2,093%)
Montenegrins			51 (0,766%)	34 (0,698%)
Slovenes			7 (0,105%)	10 (0,205%)
Macedonians			1 (0,015%)	1 (0,021%)
Albanians				9 (0,185%)

Ethnic composition – Teslić municipality
Nationality	2013.	1991.	1981.	1971.
Total	38,536 (100,0%)	59,854 (100,0%)	60,434 (100,0%)	52,713 (100,0%)
Serbs	29,041 (75,36%)	32,962 (55,07%)	35,024 (57,95%)	32,756 (62,14%)
Bosniaks	7,184 (18,64%)	12,802 (21,39%)	11,148 (18,45%)	10,000 (18,97%)
Croats	1,442 (3,742%)	9,525 (15,91%)	10,744 (17,78%)	9,467 (17,96%)
Others	869 (2,255%)	1,100 (1,838%)	204 (0,338%)	285 (0,541%)
Yugoslavs		3 465 (5,789%)	3 155 (5,221%)	108 (0,205%)
Montenegrins			93 (0,154%)	67 (0,127%)
Roma			43 (0,071%)
Slovenes			8 (0,013%)	18 (0,034%)
Albanians			8 (0,013%)	9 (0,017%)
Macedonians			7 (0,012%)	3 (0,006%)

The following table gives a preview of the total number of registered people employed in professional fields per their core activity (as of 2018):

Professional field	Total
Agriculture, forestry and fishing	290
Mining and quarrying	1
Manufacturing	2,910
Electricity, gas, steam and air conditioning supply	55
Water supply; sewerage, waste management and remediation activities	125
Construction	445
Wholesale and retail trade, repair of motor vehicles and motorcycles	1,139
Transportation and storage	252
Accommodation and food services	527
Information and communication	20
Financial and insurance activities	52
Real estate activities	3
Professional, scientific and technical activities	85
Administrative and support service activities	8
Public administration and defense; compulsory social security	330
Education	681
Human health and social work activities	330
Arts, entertainment and recreation	29
Other service activities	117
Total	7,399

• Borki Predojević, professional chess player
• Dragan Blatnjak, footballer
• Slaviša Gačić, professional footballer
• Vladimir Petrović, footballer
• Željka Cvijanović, President of the Presidency of Bosnia and Herzegovina
• Dragan Bogdanić, Minister of Health and Social Welfare of Republika Srpska

• Jezera, formerly a village in Teslić
• Kusići, formerly a sub-village of Jezera
• Vrela, a village in Teslić
• Žarkovina, a village in Teslić
• Usora River
• Krstova Gora hill (formerly Gračun)

• Official website