Abstract. Non‐human primate sera were investigated for the presence of various human immunoglobulin epitopes including allotypes of ϰ‐, γ1‐, γ2‐, γ3‐ and α2‐chains, isotypes of ϰ‐, γ1‐, γ2‐, γ3‐, γ4‐, α1‐, α2‐ and μ‐chains and iso‐allotypes. The non‐human primate sera comprised representatives of several species of apes, Old World monkeys, New World monkeys and prosimians.It is concluded that non‐human primate immunoglobulins have many structural similarities with those of human IgM, IgA and IgG. The extent of these similarities parallels the taxonomic classification.