John III, Duke of Saxe-Lauenburg
{{Unreferenced|date=December 2009}}
{{Infobox royalty
| name =John III
| image =
| alt =
| caption =
| succession = Duke of Saxe-Bergedorf-Mölln
| moretext =
| reign = 1343–1356
| coronation =
| cor-type =
| predecessor =Albert IV of Saxe-Lauenburg
| pre-type = Predecessor
| regent =
| reg-type =
| successor =Albert V of Saxe-Lauenburg
| suc-type = Successor
| spouse =
| spouse-type =
| issue =
| issue-link =
| issue-pipe =
| house = Ascania
| father =Albert IV of Saxe-Lauenburg
| mother = Beata of Schwerin
| birth_date = mid-1330s
| birth_place =
| death_date = 1356
| death_place =
| date of burial =
| place of burial =
| signature =
}}
John III of Saxe-Lauenburg (mid 1330s – 1356) was the eldest son of Duke Albert IV of Saxe-Lauenburg and Beata of Schwerin (*?–before 1341*), daughter of Gunzelin VI, Count of Schwerin. John III succeeded his father in 1343 as Duke of Saxe-Bergedorf-Mölln, a branch duchy of Saxe-Lauenburg. He died without an heir and was succeeded by his younger brother Albert V.
Ancestry
{{ahnentafel
|collapsed=yes |align=center
|boxstyle_1=background-color: #fcc;
|boxstyle_2=background-color: #fb9;
|boxstyle_3=background-color: #ffc;
|boxstyle_4=background-color: #bfc;
|1= 1. John III, Duke of Saxe-Lauenburg
|2= 2. Albert IV, Duke of Saxe-Lauenburg
|3= 3. Beata of Schwerin
|4= 4. John II, Duke of Saxe-Lauenburg
|5= 5. Elisabeth of Schauenburg and Holstein-Rendsburg
|6= 6. Gunzelin VI, Count of Schwerin
|7= 7. Richardis (Rixa) of Tecklenburg
|8= 8. John I, Duke of Saxony
|9= 9. Ingeborg Birgersdotter of Småland
|10= 10. Henry I, Count of Schauenburg and Holstein-Rendsburg
|11= 11. Heilwig of Bronckhorst
|12= 12. Niklot I, Count of Schwerin-Wittenburg
|13= 13. Elisabeth of Schauenburg and Holstein-Kiel
|14= 14. Otto IV, Count of Tecklenburg
|15= 15. Beatrix of Rietberg
}}
{{S-start}}
{{S-hou|House of Ascania||mid-1330s||1356|name=John (Johann) III, Duke of Saxony, Angria and Westphalia
}}
{{S-reg}}
{{S-bef|before=Albert IV}}
{{S-ttl|title=Duke of Saxe-Bergedorf-Mölln|years=1343–1356}}
{{S-aft|after=Albert V}}
|-
{{S-end}}
{{DEFAULTSORT:Saxe-Lauenburg, John Iii Of}}
Category:Year of birth unknown
{{Germany-royal-stub}}