Are there British embassies in every country in the world?

No, there are not. Here you go, the big list, with an interactive map: http://www.fco.gov.uk/en/travel-and-living-abroad/find-an-embassy/? read more

No, no country has embassies in every country in the world. For example we don’t have an embassy in North Korea(but that is an extreme example). We mostly only have embassies in the nations of our allies, or nations with which there is tension (Russia, for example). read more

No, the US does not have embassies in every country. We currently do not have embassies in North Korea, Bhutan, or Iran. In some places we have one ambassador covering several countries. The ambassador is resident in one country, and occasionally visits the other countries to which he or she is accredited. read more