In Singapore, can the first wife object to her husband marrying another?

Yes. The first wife can raise her objection with ROMM during the Kadi's inquiry, and if the application is still approved, she can appeal to the Appeal Board. The Kadi may summon the existing wife and weigh her views together with the applicant's financial means and reasons for wishing to marry again. After the second marriage, the first wife may also apply for divorce on the ground of unequal treatment. Appeal Board decisions show that financial means and the wife's consent alone are not enough without a reasonable cause — for example Ja'afer bin Kassim [2010] 5 SSAR 179 was dismissed, while Saheeda Banu v Osman Mohamed Sabeer [1998] 5 SSAR 164 was allowed with undertakings on maintenance and a separate home. See Singapore.