Kaškar was a city and once (arch?)bishopric in Arabia, and is now a Chaldean Catholic titular see.
Its location is Al-Wasit (which has namesakes elsewhere), in present Oman.
The diocese, which had faded, was nominally restored in 1967 as a Chaldean Catholic titular archbishopric.
It is vacant, having had had a single incumbent, of the intermediate (archiepiscopal) rank :