Pelletier will be responsible for the development of Fidelity's infrastructure strategy and promoting products across infrastructure debt and equity.
Prior to this role, she was global head of infrastructure at Schroders and CEO of Schroders Capital Management in France.
She also spent over 20 years in senior global roles at Caisse de dépôt et placement du Québec.
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Haight will be responsible for advancing Fidelity's infrastructure finance sector, including developing and launching infrastructure credit strategies and products.
She was previously an infrastructure debt partner at Ares Management and prior to that, she spent ten years at AMP Capital.
Haight is also a member of the Investment Advisory board for United Nations Office for Disaster Risk Reduction.
Andrew McCaffery, global CIO at Fidelity International, said these new senior hires were a "testament" to the firm's commitment in building a broad private assets business, ensuring it has "the right level of support and technical expertise" to help drive its "ambitious" expansion plans over the decade.
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"Within private assets, infrastructure assets have more than quadrupled over the last decade and are expected to keep growing at the same speed over the coming years," he said.
"New dynamics driven by energy transition, mobility and digitisation introduce a multi-trillion investable market, and by expanding our expertise in this area, we are pleased to be able offer our clients additional investment diversification."