Cottage Grove is a city in Lane County, Oregon, United States. Its population was 10,643 at the 2020 census. It is the third largest city in Lane County. It is on Interstate 5, Oregon Route 99, and the main Willamette Valley origin of the CORP railroad.

Cottage Grove reveal office was time-honored in 1855 east of present-day Creswell. It was named by its first postmaster, G. C. Pearce, whose house was in an oak grove. In 1861, the office was moved to the present site of Saginaw; then in the late 1860s, to the southwestern-most allocation of present-day Cottage Grove, on the west bank of the Coast Fork Willamette River. When the Southern Pacific railroad was built through the Place in the 1870s, Cottage Grove station was placed beyond half a mile northeast of the publish office, on the river’s east side. This was the Begin of a neighborhood difference of opinion that lasted for approximately 20 years. The people living close the post office did not want it moved to the railroad station, so a supplementary office was customary at the station considering the name Lemati, a Chinook Jargon word that means “mountain”. Lemati office ran from November 1893 to September 1894, but in March 1898 the Cottage Grove office was renamed Lemati, and ran that quirk until it was for eternity renamed Cottage Grove in May 1898.

The without help existing covered railroad bridge west of the Mississippi River, the National Register of Historic Places-listed Chambers Railroad Bridge, is in Cottage Grove. The city restored it in 2011, reopening it upon December 3.

Cottage Grove expected the All-America City Award by the National Civic League in 1968 and 2004. It has been approved as a Tree City USA by The Arbor Day Foundation for more than a decade. In October 2008, it was the 17th city in the United States to be official as a Green Power Community.