Mr. Flotsam and Mr. Jetsam

{{Short description|Anglo-Australian comedy duo (1920s–1930s)}}

{{EngvarB|date=August 2015}}

{{Use dmy dates|date=February 2025}}

{{More citations needed|date=December 2013}}

{{Infobox musical artist

| name = Flotsam and Jetsam

| image =

| image_size =

| image_upright =

| landscape =

| alt =

| caption =

| background = group_or_band

| alias =

| origin = England
Australia

| genre = Comic songs

| years_active = 1920s–1930s

| label =

| website =

| current_members =

| past_members = *Bentley Collingwood Hilliam

• Malcolm McEachern

}}

Mr. Flotsam and Mr. Jetsam were an Anglo-Australian musical comedy duo of the 1920s and 1930s. Mr. Flotsam's real name was Bentley Collingwood Hilliam (1890–1968) and Mr. Jetsam's real name was Malcolm McEachern (1883–1945). Hilliam wrote most of their songs, played the piano and sang in a light, high tenor voice. By contrast, McEachern had one of the deepest bass voices on record. Their material consisted of comic songs with rapid-fire delivery and songs with mild social commentary, as well as sentimental songs.

They are sometimes considered a precursor of Flanders and Swann.