In real estate, a condominium conversion or condo conversion is the process of entitling an income property or other lands currently held under one title to convert from sole ownership of the entire property (which often already is a multi unit property) into individually sold units as condominiums. Such entitlement is generally derived from approvals granted by state/provincial and/or local municipal authorities (and often other relevant agencies, such as conservation authorities).

Indeed, though, virtually every condominium project could be characterized as a conversion of property that is held generally under one title, to property that is severed into portions so that the title to most such portions (i.e., units) can be held separately. However, the term "conversion" is usually reserved for just those projects which involve changing the title (and sometimes also the use) of an existing structure, such as a multi-dwelling apartment building, row dwellings (townhomes) or a commercial multi-unit rental site.