On 25 September 2015, the United Nations (UN) General Assembly unanimously voted for the post-2015 UN resolution on the post-2015 Sustainable Development Goal (SDG) agenda. This article argues that although the post-2015 SDG agenda is an advance on its precursor the Millennium Development Goals (MDGs)—especially for progressing the human rights of persons with disabilities in development settings, everywhere—it should nonetheless be approached with caution. This article will identify “three steps forward” for persons with disabilities within the broad content of the post-2015 SDGs, while also highlighting four potential “steps back”. It concludes persons with disabilities, disability rights advocates and their supporters must remain vigilant as the post-SDG UN resolution is now operationalised and implemented by UN Member States and their many partners. This is particularly so if the content of the Convention on the Rights of Persons with Disabilities is to be effectively integrated into the post-2015 development policy and planning landscape.