As was stated, the Papacy is an elective Monarchy.
A surviving HRE would be an elective monarchy, if you have no problem with the
de facto hereditary Hapsburg Emperor. Of course, that problem can be solved with a stronger HRE before the rise of the Hapsburgs.
Poland-Lithuania also if you were able to avoid the Anarchy and disputes in the Sejm over the future King to be elected.
France remained a
de jure elective monarchy during its early years. It was a
de facto hereditary monarchy as the French King always had their eldest son elected as co-king, then crowned during their lifetime. This pratice started with the late Carolingians (Lothaire had his son Louis V elected as co-King, and I think Louis IV had done the same for him) and ended with Philip II Augustus. After him, French Royal Control was strong enough that there was no need for an elective monarchy, even
de jure.
Keeping Royal Control weak, you might end up with a French elective monarchy rather than an hereditary one. But that's not easy to do without destroying France itself in my opinion.
Anglo-Saxon England also had an elective monarchy before William the Conqueror came in if I'm not wrong. Having Harold defeat William at Hastings could be a solution.
VictorLaszlo said:
Had there been no WW2, Hungary might have become an elective monarchy, since it was a monarchy without a monarch after WW1 with Horthy as Regent. After Horthys death, his position might have been replaced by an elective monarch.
Not sure. A Hapsburg restoration would seem more likely in that scenario in my opinion. Horthy might not have wished for the Hapsburg to come back (he feared the Little Entente would have declared war on Hungary if they did), but if there was to be a Monarchy, it probably would have been a Hapsbug one.Charles I of Austria/IV of Hungary was very popular among his people before he was overthrown.
At least, that's how I see this. But I'm no expert on Hungary nor on post-1900 history.