Ohio State Route 199 (SR 199) is a north-south highway in northwest Ohio. Its southern terminus is at an interchange with US 23 just south of Upper Sandusky, and its northern terminus is at US 20 and SR 795 in Perrysburg.

The route begins northerly into Upper Sandusky, and then on to Carey, where it joins US 23. The two routes run concurrently from Carey to Fostoria. From there, SR 199 continues to West Millgrove and to US 6, whose route it joins for a mile (1.6 km) as it crosses the Portage River. The route then continues north to Perrysburg.

Most of SR 199 was formerly the route of US 23. Before 1966, SR 199 was truncated at the south in Fostoria, followed most of the current route of US 23, and was truncated at the north just east of Toledo, Ohio. In 1966, SR 199 was extended along its current route to Upper Sandusky along US 23's current route from Fostoria to Carey and its old route from Carey to Upper Sandusky. In 1969, it switched routes with US 23 from Fostoria to Perrysburg.

County	Location	mi	km	Destinations	Notes
Wyandot	Pitt Township	0.000	0.000	US 23 / CR 61 – Marion, Carey	Interchange
	Upper Sandusky	4.342	6.988	SR 53 east / SR 67 north (Sandusky Avenue) / Wyandot Avenue	Southern end of SR 53 / SR 67 concurrency
		4.506	7.252	SR 53 west / SR 67 south (8th Street)	Northern end of SR 53 / SR 67 concurrency
		7.053– 7.160	11.351– 11.523	US 23 / US 30 to I-75 – Marion	Interchange
	Carey	14.218	22.882	SR 103 east – Sycamore	Southern end of SR 103 concurrency
		15.401	24.786	US 23 south / SR 103 west (Vance Street) / SR 568 west (Findlay Street)	Northern end of SR 103 concurrency; southern end of US 23 concurrency; eastern terminus of SR 568
Seneca	Loudon Township	24.781	39.881	US 224 – Findlay, Tiffin
	Fostoria	29.579– 29.588	47.603– 47.617	SR 18 east (East Lytle Street)	Southern end of SR 18 concurrency
		30.093	48.430	SR 12 west (West Lytle Street)	Southern end of SR 12 concurrency
		30.394– 30.465	48.914– 49.029	SR 12 east (East South Street)	Northern end of SR 12 concurrency
Seneca–Hancock county line		30.918	49.758	SR 18 west / SR 613 west (West North Street)	Northern end of SR 18 concurrency; eastern terminus of SR 613
Seneca–Wood county line		31.840	51.242	US 23 north (North County Line Street)	Northern end of US 23 concurrency
Wood	Montgomery Township	40.953	65.907	SR 281 (Defiance Pike) – Defiance, Wayne, Bradner
	Freedom Township	46.313	74.534	US 6 east – Fremont	Southern end of US 6 concurrency
		47.284	76.096	US 6 west – Bowling Green	Northern end of US 6 concurrency
	Webster Township	50.188	80.770	SR 105 – Bowling Green, Pemberville
		54.420	87.581	SR 582 – Haskins, Luckey, Woodville
	Perrysburg	62.160	100.037	US 20 (Louisiana Avenue) / SR 795 east (Indiana Avenue)	Western terminus of SR 795
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus