How, When and with Whom

{{Infobox film

| name = How, When and with Whom

| image = Come, quando, perché.jpg

| caption =

| director = Antonio Pietrangeli

| writer =

| starring =

| music = Armando Trovajoli

| cinematography = Mario Montuori

| editing =

| producer =

| distributor =

| released = {{Film date|1969}}

| runtime =

| country = Italy

| language = Italian

| budget =

}}

Come, quando, perché, internationally released as How, When and with Whom, is a 1969 Italian romance film written and directed by Antonio Pietrangeli. It is the last film of Pietrangeli, who died drowning in the sea of Gaeta, while he was testing some shots for the next day; he was eventually replaced by Valerio Zurlini.{{cite book|author1=Guglielmina Morelli |author2=Giulio Martini |author3=Giancarlo Zappoli |title=Un'invisibile presenza: il cinema di Antonio Pietrangeli|publisher=Il Castoro, 1998}}{{cite book|last=Enrico Giacovelli|title=La commedia all'italiana|publisher=Gremese Editore, 1995}}