The largest source of ergonomics standards is ISO/TC 159, the main ergonomics committee. If you look at its catalogue page at ISO, you will only see one document but there are also links to four sub committees which produce lots of ergonomics standards.
ISO/TC 159/SC 1 General ergonomics principles
ISO/TC 159/SC 3 Anthropometry and biomechanics
ISO/TC 159/SC 4 Ergonomics of human-system interaction
ISO/TC 159/SC 5 Ergonomics of the physical environment
Here are some more ergonomics and human factors related standards you might find useful.