The U.S. Supreme Court relisted for review a trio of cases that address whether employers can discriminate against LGBT workers without violating federal civil rights law.

The justices are now scheduled to consider whether to accept the cases at the court’s Jan. 18 conference. The court could announce the same day whether it will grant or deny review in any of them.

The Supreme Court has now relisted the petitions several times. Relisting a petition for certiorari at more than one conference has, in recent terms, been a sign that the court is more likely to grant review. It could...