William Landergan

{{Short description|American politician and jurist}}

{{Use mdy dates|date=June 2025}}

{{Infobox officeholder

| image = 1935 William Landergan Massachusetts House of Representatives.png

| imagesize =

| name = William Landergan

| birth_date = August 28, 1899 {{cite book |title=Public Officials of Massachusetts |publisher=Boston Review | url=https://archive.org/texts/flipbook/flippy.php?id=publicofficialso19351936bost }}

| birth_place = Lynn, Massachusetts

| death_date = {{death date and age|1970|4|15|1899|8|28}}

| death_place =

| restingplace =

| nationality =

| occupation = Lawyer
Politician
Judge

| residence = Lynn, Massachusetts

| party = Democrat

| spouse =

| alma_mater = Bentley School of Accounting and Finance
Boston University Law School{{cite book |title=Public Officials of Massachusetts |publisher=Boston Review | url=https://archive.org/details/publicofficialso19391940bost}}

| title = Member of the Massachusetts House of Representatives from the 10th Essex district

| term_start = 1935

| term_end = 1937

| predecessor = C. F. Nelson Pratt

| successor = Frederick Willis

| caption = Portrait of William Landergan

}}

William Joseph Landergan (August 28, 1899 – April 15, 1970) was an American politician and jurist.

Landergan served as a member of the Massachusetts House of Representatives from 1935–1937 and later served as a judge in the Lynn District Court.