Conservation finance is the practice of raising and managing capital to support land, water, and resource conservation. It draws on public, private, and nonprofit funding sources, and can use instruments ranging from loans and grants to tax incentives and market-based mechanisms, at scales from local to national.

Conservation projects have traditionally relied on philanthropic donations and foundation grants, alongside government funding such as tax incentives, ballot measures, bonds, and agency appropriations. Some practitioners argue that these sources do not meet estimated global conservation needs; one widely cited estimate compared annual needs of hundreds of billions of dollars with much lower annual flows directed to conservation finance.

In response, conservation finance is sometimes framed as expanding the set of tools and capital sources used for conservation, including approaches that seek to leverage philanthropic and government resources with capital from financial markets, such as debt financing, tax benefits, private equity, and project finance. Examples discussed in the literature and policy documents include debt-for-nature swaps, payments for ecosystem services, and green bonds, as well as conservation-related funding delivered through foreign aid programmes.

Conservation finance is sometimes distinguished from traditional conservation fundraising and funding. In this usage, fundraising and funding refer to raising and distributing non-repayable support, such as donations, foundation grants, and government appropriations, to pay for conservation work, while conservation finance refers to using a broader set of financial tools and capital sources to mobilise and manage capital for conservation outcomes.

Proponents of conservation finance often argue that existing public and philanthropic funding flows are far below estimated global conservation needs; one widely cited estimate compared annual needs of hundreds of billions of dollars with much lower annual flows directed to conservation finance. In response, conservation finance has been described as leveraging philanthropic and government resources with other sources of capital, including capital markets, through tools such as debt financing, tax benefits, private equity investments, and project finance.

Many conservation projects were historically financed through government appropriations and philanthropic grants, but the set of tools expanded over time to include mechanisms that link funding to specific conservation actions or outcomes and that seek additional sources of capital. Early examples include debt-for-nature swaps (developed in the 1980s) and the later growth of incentive-based approaches such as payments for ecosystem services. By the mid-2000s, conservation finance was increasingly described as a distinct field, with reference works cataloguing instruments ranging from land-protection tools and dedicated funds to market-based mechanisms and investment structures. More recent policy and market analyses emphasise mobilising larger volumes of private capital for nature-related outcomes, including through labelled bond markets and blended finance structures that combine public or philanthropic capital with private investment to improve project risk–return characteristics.

Conservationists have traditionally relied upon private, philanthropic capital in the form of solicited donations and foundation grants, and public, governmental funds in the form of tax incentives, ballot measures, bonds, and agency appropriations, to fund conservation projects and initiatives.

Conservation finance can involve multiple categories of actors that provide capital, structure transactions, and implement projects. The mix of sources that can contribute to nature-related outcomes includes domestic public expenditures, international public finance (including official development assistance), and private expenditures and investments. Market-rate capital can come from private investors as well as from public and philanthropic investors operating through development finance institutions and multilateral development banks.