The global ParityPledge aims to bring gender parity to the highest level of business, by requiring organisations to make a public commitment to interview at least one qualified woman for every executive position.
FMG will be one the first companies in Australia to take the pledge, leading the way for resources companies globally.
FMG has a female CEO, Elizabeth Gaines, and deputy CEO, Julie Shuttleworth, and five of its nine directors are female, including co-deputy chair Sharon Warburton.
The company also has 26% women in senior management roles and 19.4% female participation overall.
Gaines said the best results came from a diverse workforce that was supported and encouraged to reach its full potential.
"Making this commitment to the ParityPledge builds on Fortescue's practical policies to support women and to foster a workplace that truly embraces diversity," she said.
"By focussing on supporting leadership development, the retention of female talent and providing more balance and flexibility in the workplace, we want to ensure that as many women as possible have the opportunity to participate and make a strong contribution to the Australian resources sector."
Solomon general manager Jessica Pringle said FMG was helping to build a pipeline of women ready to pursue a career in the mining industry.
"To benefit from increased diversity in the mining sector, we need to focus on capability as part of the recruitment process and ensure we are building a greater pool of talent," she said.
"Programs such as Fortescue's Trade Up and Vocational Training and Employment Centres are helping to provide our female team members with practical measures to gain operational and trade qualifications."
FMG has implemented paid parental leave, flexible working arrangements, a domestic violence policy, and has made a commitment to gender pay equity.
The company has a 24 hour a day Fortescue Family Room in Perth and is introducing in-home childcare in Port Hedland.