TBILISI, Georgia — Georgian parliamentary speaker Shalva Papuashvili said in a Facebook post on Thursday that he had signed into law a “family values” bill curbing LGBT rights, just weeks before a high-stakes parliamentary election.

Lawmakers from the ruling Georgian Dream party last month approved the bill, which bans gender transitions and could outlaw pride marches and displays of the LGBT rainbow flag. The party says the law is necessary to protect Georgia’s Orthodox Christian…