Third Creek is a stream in Gasconade and Osage counties of central Missouri. It is a tributary of the Gasconade River.
The stream headwaters are in Gasconade County at 38.3631°N -91.4925°W and the confluence with the Gasconade is in Osage County at 38.4317°N -91.6672°W. The stream source is just west of Missouri Route 19 north of Owensville. The stream flows northwest past Old Woollam and, after passing under Missouri Routes P and A, it gains the flow of its southern tributary Crider Creek, and enters Osage County about 1.5 mile before it joins the Gasconade at Cooper Hill.[1]
Third Creek was named for the fact it is the third in order of tributaries on the Gasconade River from the nearby Missouri River.[2]