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is a city in Westmoreland County, Pennsylvania, United States. The population was 5,667 at the 2000 census.
The beginnings of the area show that around the year 1781, Robert McCrea purchased the land on which Arnold now stands. Sometime later William Jack gained the property of Arnold who later passed it on to Wilson Jack. The area of Arnold was first settled in 1852 by Major Andrew Arnold, who grew up in Kittanning. However, it did not become a separate borough until January 14, 1896. This is because today’s Arnold was at one time part of the city New Kensington. It is known as the “Proud City of Proud People”.