An excel-overview of laws, lawsuits and law proposals concerning end of life options worldwide, can be found here. This is a document in progress and not up-to-date, feel free to comment!
Assisted dying (see definition here) in some form is legal in the Netherlands, Belgium, Canada, Colombia, Luxembourg, New Zealand, Switzerland, Spain, Germany, Austria, all the six states in Australia (Victoria, Western Australia, Tasmania, South Australia, Queensland and New South Wales), and in 11 USA states (Oregon, Washington, Vermont, Montana, Colorado, California, District of Columbia, Hawaii, New Jersey, Maine and New Mexico). It differs per country how assisted dying is legalized.
Argentina
Brazil
Canada
– Quebec
Chile
Colombia
Falkland Islands
Mexico
United States
Uruguay
South Africa
Albania
Austria
Belgium
Denmark
France
Germany
Iceland
Ireland
Italy
Luxembourg
The Netherlands
Norway
Portugal
Spain
Sweden
Switzerland
United Kingdom
– Scotland
– Northern Ireland
– England
– Wales
China
Hong Kong
Israel
Japan
Taiwan