Dalmatia Creek is a tributary of the Susquehanna River in Northumberland County, Pennsylvania, in the United States.

Both it and its tributaries are designated as impaired waterbodies due to sedimentation/siltation from crop-related agriculture and vegetation removal.

The creek then flows west-southwest for a few tenths of a mile, receiving an unnamed tributary from the left before turning west.

A short distance further downstream, it crosses Pennsylvania Route 147 and reaches its confluence with the Susquehanna River.

[1] Dalmatia Creek joins the Susquehanna River 108.25 miles (174.21 km) upstream of its mouth.

However, a tributary in the creek's upper reaches has some riparian buffering, reduced erosion, and relatively stable streambanks.

[4] The peak annual discharge at the mouth of Dalmatia Creek has a 10 percent chance of reaching 630 cubic feet per second (18 m3/s).

[3] The average annual rate of precipitation in the watershed of Dalmatia Creek over a 19-year period was 39.30 inches (99.8 cm).

[1] The highest elevations in the watershed are as high as 960 feet (290 m), while the lowest occur at the creek's mouth.

This, combined with the lack of vegetation in agricultural areas, causes excessive runoff during precipitation events.

The dominant surface geology is schist, a metamorphic rock, which underlies the entire watershed.

[3] cobbles of chert of varying sizes have been observed on the eastern bank of the Susquehanna River, not far from the creek.

[2] The mouth of the creek is in the United States Geological Survey quadrangle of Dalmatia.

[3] Dalmatia Creek, along with numerous other streams in the area, experienced flooding during Tropical Storm Agnes in June 1972.

[10] In July 2012, the Lower Mahanoy Township Municipal Authority received a Water Obstructions and Encroachments permit to build, maintain, and operate an elevated platform for the control panel of the Dalmatia Creek grinder Pump Station near Dalmatia Creek itself.

[11] In August 2012, the Pennsylvania Department of Environmental Protection invited comments on its proposed Total Maximum Daily Load plan for Dalmatia Creek.

[4] In 2016, the Pennsylvania Fish and Boat Commission passed regulations affecting Dalmatia Creek from its mouth to a point 0.5 miles (0.80 km) upstream.