Studies about Philippine colonial class structure are singularly scant. With the exception of Scott's work on the sixteenth century, no effort has yet been made to shed light upon the problem of how Philippine society had been stratified during the long span of the Spanish and American regimes. This paper tries to describe and analyze the manner in which a segment of nineteenth-century Philippine society was structured, and offers a conceptualization of what constituted a provincial “social class” at the time by looking at the role of the inquilino (leaseholders of agricultural land) in Caviteño society. Specifically, it (a) rejects the idea that native Filipino society was composed of only two social strata: a tiny upper stratum and a mass of uniformly poor population; (b) and implies that the native class structure was far from having been static during the Spanish regime. Due to limitations in the sources, no attempt has been made to trace in an evolutionary manner the development of the inquilinos as a social class. The study deals mainly with the Dominican hacienda town of Naic, although less detailed information on other municipalities like Imus, Bacoor, Kawit, Santa Cruz de Malabon, and San Francisco de Malabon suggest the existence of similar conditions that could have fostered the development of an intermediate social class composed largely of inquilinos.