Where was The Grass Is Greener filmed?
1960 film by Stanley Donen
The Grass Is Greener (1960) was filmed in Isleworth, Shepperton Studios, Osterley House and Osterley, 4 places named in its Wikipedia article, in the United Kingdom. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.
Places per Wikipedia's article
The Wikipedia article names 4 places. Each links to the sentence that says so.
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Studios & sets
Shepperton Studios
United Kingdom
Film studio, special effects studios and pre- and post-production centre
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Landmarks & buildings
Osterley House
England
Historic house museum in London
“Osterley Park in Isleworth, London, was used as the location for the stately home, while interiors were shot at Shepperton Studios using furniture and artifacts from several real-life stately homes.” Wikipedia
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Towns & cities
Isleworth
England
Town in west London
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Towns & cities
Osterley
England
District of the historic parish of Isleworth in west London, England