Walsh may refer to:

People and fictional characters

* Walsh (surname), including a list of people and fictional characters with the surname

Places

* Fort Walsh, one of the first posts of the Royal Canadian Mounted Police *

Walsh, Ontario Walsh (formerly known as Charlotteville Centre) is a medium-sized hamlet in Norfolk County, Ontario, Canada. Summary Walsh developed as a township central crossroads gathering point on Young's Creek, in the first quarter of the 19th century. A ...

, Norfolk County, Ontario, Canada *

Walsh, Colorado Walsh is a Statutory Town in Baca County, Colorado, United States. The population was 546 at the 2010 census, down from 723 at the 2000 census. A post office called Walsh has been in operation since 1926. The community was named after one Mr ...

, USA * Walsh, Michigan, USA *

Walsh, Wisconsin Walsh is an unincorporated community located in the town of Porterfield, in Marinette County, Wisconsin, United States. Geography Walsh is located along County Trunk Highway G at the intersection with Bagley Road and Twin Creek Road,''Porterfiel ...

, USA * Walsh County, North Dakota, USA * Walsh, Alberta, a hamlet in Canada *

Walsh Lake (Lac-Jacques-Cartier) Lake Walsh is a fresh water body crossed to the west on by the discharge current from Fragasso Lake in Jacques-Cartier National Park. This lake is located entirely in the unorganized territory of Lac-Jacques-Cartier, Quebec, Lac-Jacques-Cartier, ...

, Canada * Mount Walsh National Park, Australia

Schools

* Walsh University, North Canton, Ohio * Walsh College, Troy, Michigan *

Walsh School of Foreign Service The Edmund A. Walsh School of Foreign Service (SFS) is the school of international relations at Georgetown University in Washington, D.C. It is considered to be one of the world's leading international affairs schools, granting degrees at both ...

, Washington, D.C. * Walsh Jesuit High School, Cuyahoga Falls, Ohio

Ships

* USS ''Walsh'' (APD-111), a United States Navy high-speed transport in commission from 1945 to 1946, originally intended to be a destroyer escort

Mathematics

Walsh function In mathematics, more specifically in harmonic analysis, Walsh functions form a complete orthogonal set of functions that can be used to represent any discrete function—just like trigonometric functions can be used to represent any continuous fu ...

, an orthogonal basis of the square-integrable functions on the unit interval *

Walsh matrix In mathematics, a Walsh matrix is a specific square matrix of dimensions 2, where ''n'' is some particular natural number. The entries of the matrix are either +1 or −1 and its rows as well as columns are orthogonal, i.e. dot product is ...

, an orthogonal matrix with several useful properties * Walsh transform, a linear transform based on the Walsh matrix

Other