This volume contains papers presented at the 5th International Workshop on the History of Speech Communication Research (Porto, 2022). This conference was designed to commemorate the 120th anniversary of the birth of the Portuguese phonetician Armando de Lacerda (1902–1984). The papers address the life and work of Armando de Lacerda in the context of the development of experimental phonetics throughout Europe and in Brazil in the mid twentieth century. The workshop was jointly organized by the International Speech Communication Association Special Interest Group on “The History of Speech Communication Sciences”, the Institute of Contemporary History (NOVA University of Lisbon; University of Évora), the University of Porto (Rectory; Linguistics Centre), Ferraz de Lacerda, Lda., and supported by the International Phonetic Association. It was also sponsored by the University of Coimbra (Science Museum; Faculty of Letters).