Smilgaitis

{{Infobox river

| name =Smilgaitis

| image =Smilgaičio kilpos.JPG

| image_size =

| image_alt =

| image_caption = Smilgaitis near Stasiūnai, Kėdainiai

| map =

| map_size =

| map_alt =

| map_caption =

| source1_location = Near Krakės

| source1_coordinates= {{coord|55.4155|23.6870|display=|region:LT_type:river}}

| mouth = Smilga

| mouth_coordinates = {{coord|55.2920|23.8946|display=it|region:LT_type:river}}

| progression = {{RSmilga}}

| subdivision_type1 = Country

| subdivision_name1 = Lithuania

| subdivision_type2 = Region

| subdivision_name2 = Kėdainiai district municipality, Kaunas County

| length = {{convert|34.2|km|abbr=on}}

| source1_elevation =

| mouth_elevation =

| discharge1_avg = 0.41 m³/s

| basin_size = {{convert|75.6|km2|abbr=on}}

| river_system =

| tributaries_left =

| tributaries_right = Dangaučius, Amalis

}}

The Smilgaitis is a river of Kėdainiai district municipality, Kaunas County, central Lithuania. It flows for {{convert|34|km}} and has a basin area of {{convert|76|km2|abbr=on}}. It is a right tributary of the river Smilga.

Its source is nearby Krakės town. It flows through the Josvainiai forest, Meironiškiai, Ruseiniai villages and meets the Smilga river near Stasiūnai. Keleriškiai pond is dammed on the Smilgaitis river.

The name Smilgaitis comes from the Lithuanian word smilga ('bentgrass').