 One caveat is that in this entry we will try to keep a unified perspective on both indicative and subjunctive conditionals. Although some authors, notably David Lewis, have insisted on treating them differently, differences can be handled parametrically relative to a common semantic core (viz., Stalnaker 1975 or Pearl 2009). We will point to differences when relevant, but refer the reader to Starr’s (2019) SEP entry on counterfactuals that deals with the topic rather extensively. On some aspects our entry also overlaps with Edgington’s (2020) SEP entry on indicative conditionals, and readers are invited to consult both of those entries for complements.