Frederick I, Duke of Brunswick-Osterode

{{Short description|Duke of Brunswick-Osterode}}

{{other people||Frederick of Brunswick-Lüneburg (disambiguation){{!}}Frederick of Brunswick-Lüneburg}}

{{More citations needed|date=May 2024}}

{{ infobox royalty

| name = Frederick I, Duke of Brunswick-Osterode

| image =

| caption =

| house = House of Guelph

| father = Ernest I, Duke of Brunswick-Grubenhagen

| mother = Adelaide of Everstein-Polle

| spouse = Adelaide of Anhalt-Zerbst

| issue = Otto II, Duke of Brunswick-Osterode

| birth_date = {{circa|1350}}

| birth_place =

| death_date = 1421

| death_place =

}}

Frederick I, Duke of Brunswick-Osterode ({{circa|1350}}-1421){{cn|date=May 2024}} was a son of Duke Ernest I and his wife, Adelaide of Everstein-Polle.{{Allgemeine Deutsche Biographie|6|257|258|Ernst der Aeltere, Herzog von Braunschweig-Grubenhagen|Ludwig Ferdinand Spehr|ADB:Ernst (Herzog von Braunschweig-Lüneburg-Grubenhagen)}}

In 1361, he succeeded his father as Count of Osterode.

He married Adelaide (d. before 1421), a daughter of Bernhard V, Prince of Anhalt-Bernburg, and was the father of Otto II (1396-1452), who succeeded him.{{Cn|date=May 2024}} He may have also married Elizabeth, heiress of Homburg.

{{S-start}}

{{S-hou|House of Guelph||{{circa|1350}}||1421}}

{{S-bef|before=Ernest I}}

{{S-ttl|title=Duke of Brunswick-Lüneburg
Count of Osterode|years=1361–1421}}

{{S-aft|after=Otto II}}

{{S-end}}