Abstract Peninsular Spanish (PS) and European Portuguese (EP) are null subject languages where subject person is expressed by verbal affixes and the use of subject pronouns is considered to be reserved e.g. for such purposes as the expression of contrast or emphasis. However, the use of pronominal subjects differs strikingly between the two languages. The present study examines the use of first person plural subject pronouns (PS nosotros and EP n o ´ s ) in corpora of spoken language and connects it with the different referential properties of first person plural. It is shown that in PS the expression of the subject pronoun nosotros is rare – it occurs only in 4.5% of all clauses with first person plural subjects – and the reference of the pronoun is always hearer-exclusive in the data under survey. In EP, the expression of the first person plural subject pronoun n o ´ s is more frequent, occurring in 32.2% of the clauses with first person plural subjects. In EP, the use of the pronoun is not restricted to the hearer-exclusive reading but is also found in contexts where the reference is construed as hearer-inclusive or impersonal. A further difference between PS and EP is that the latter has developed, in addition to first person plural proper, another construction with first person plural reference consisting of the expression a gente (literally ‘the people’) and a verb in third person singular. In the data examined, the construction with a gente is favoured with certain non-agentive verb lexemes: this tendency is argued to be connected with the origin of a gente as an impersonalizing strategy. Using evidence from contrastive analysis of two closely related languages, the paper argues that null subject languages and grammatical persons are highly divergent with regard to the frequency of subject pronoun expression and the factors affecting it.