Austria-Hungary
During the first World War, internment camps in Austria-Hungary were put in place, generally for Serbs or people who were pro-Kingdom of Serbia supporters. The pan-Serbian black hand (a secret military society) played a part in the murder of the Austro-Hungarian Archduke Franz Ferdinand, resulting in WWI. 
Germany
In Germany, male and occasionally female civilian nationals of the Allies caught on German territory were interned.
Australia
2,940 German/Austrian men had been interned in ten separate  camps in Australia. A majority of the men who were listed as Austrians were from Dalmatia, Croatian, which was, at this time, under Austrian rule.During 1915, many smaller camps closed down, their inmates brought to larger camps instead.The biggest camp was Holsworthy in New South Wales. Families of these interned men had been placed in a camp by Canberra.
Britain
During both wars (WWI & WWII), the British interned opposing  nationals (generally Germans).
Not much information given in detail of the background of British internment facilities; see "List of Internment Camps" for examples of know camps.
Netherlands
Both German and Allied soldiers/sailors that traveled through neutral Netherlands were forced into internment camps. The camp strictly for British citizens was in Groningen.
Canada
During WWI in Canada, enemy aliens (those from Germany, Austro-Hungarian and Turkish empires) were bound by internment, only if there were of "reasonable grounds" to suspect they were involved in espionage or else acting illegally. In 1916/1917, Austrians were absolved to fill labour shortages. Of 8579 men at 24 camps throughout Canada, 5954 were from Austria-Hungary. There were also 2009 Germans, 205 Turks and 99 Bulgarians. 81 women and 156 children were voluntarily interned. Major-General Sir William Otter was the officer commanding these internment camps. There were 26 camps in Ontario, Québec, Alberta and New Brunswick, however, only 2 were strictly for Canadians. Canada had harbored 817 internees; from Newfoundland and British Caribbean colonies.
America
There were different internment camps throughout America, this is the story of a major one. In May 1917,a town called Hot Springs in North Carolina had a population of about 650, soon the number would become much greater; adding approximately 2200 German internees. This was known as the largest World War I internment camp in the USA at this time. Since the town was rather small, friendships grew between interned Germans and townspeople. Family members of those interned were allowed to visit, and many locals welcomed Germans into their homes. Guards even took detainees home for dinner. The Germans taught crafts to the locals, such as dressmaking.They also entertained them with music. Despite what seemed to be an alright set up, in 1918 the flu and typhoid epidemic became fatal. Many Germans died and were put in graves in Oddfellows Cemetery.
In 1918, the US Government created a program to capture and send to internment camps women who were supposedly prostitutes working by a US military bases. Agents set up traps, resulting in the seize of many prostitutes. There are reports of these agents hiding in bushes, waiting to capture all woman who went past on the arm of a soldier.
England
In World War I, Irish republicans had been interned in camps located in Shrewbury and Bromyard.