Delegates from countries that are US allies were among those who voted against the two algorithms which are known as SIMON and SPECK.
WikiTribune reported that the rejection was based on the fact that US officials, including some from the NSA, refused to provide the standard level of technical detail needed.
In September last year, the NSA move was set back when delegates at an earlier meeting of the ISO took a stand against advancing the two encryption techniques as global standards.
Though the NSA relented and agreed to adopt only the strongest versions of these techniques which are least likely to be vulnerable to hacks, the Wuhan meeting was not convinced.
Since the revelations about NSA snooping by former contractor Edward Snowden in 2013, several delegates have expressed doubts over the NSA's motives for pushing the two algorithms. Snowden released documents which showed the agency had previously planned to manipulate standards and promote technology it could penetrate.
The WikiTribune report said the opposition to the NSA move was led, in Wuhan, by Dr Tomer Ashur from KU Leuven University, representing the Belgian delegation, and he was backed by many other countries.