Mortimer is a ghost town in Osage Township, Labette County, Kansas, United States.

The community was founded by Emanuel "Governor" Mortimer (son of revolutionary war patriot Famous Mortimer), a lawyer originally from Kentucky who came to Kansas with his family on a wagon train from Illinois in 1868 when the Osage Ceded Lands were opened to settlement following the American Civil War.

[2] When the Memphis, Kansas and Colorado Railroad set to work extending their tracks from Parsons to Cherryvale in 1880, the route ran directly through Governor Mortimer's property.

[3] He seized the opportunity, and on January 7, 1883, he filed a plat for the town of Mortimer, which would be situated directly adjacent to the railroad right-of-way.

[7] The Cherryvale newspaper reported in April 1884 that Mortimer had a grain elevator, railroad freight house, railroad passenger depot, post office, general store, drug store, doctor's office, blacksmith shop, and an architect/builder.