Viscount Southwell

{{Short description|Title in the peerage of Ireland}}

{{Use dmy dates|date=April 2022}}

{{Infobox nobility title

| name = Viscountcy Southwell

| image = 150px
180px

| image_size =

| alt =

| caption = Escutcheon: Argent three Cinquefoils pierced Gules charged on each leaf with an Annulet of the field; Crest: A Demi Indian Goat Argent armed and eared Gules ducally gorged Or and charged on the body with three Annulets in bend also Gules; Supporters: On either side an Indian Goat Argent ducally collared chained and charged on the body with three Annulets Gules

| creation_date = 18 July 1776

| creation =

| monarch = George III

| peerage = Peerage of Ireland

| baronetage =

| first_holder = Thomas, 3rd Baron Southwell

| last_holder =

| present_holder = Richard Andrew Pyers Southwell, 8th Viscount

| heir_apparent =

| heir_presumptive = The Hon. Charles Anthony John Southwell

| remainder_to = Heirs male of the first viscount's body, lawfully begotten

| subsidiary_titles = Baron Southwell
Baronet

| status =

| extinction_date =

| family_seat =

| former_seat = Nec Male Notus Eques (Not an unknown knight)

| motto = Deo Favente

| footnotes =

}}

Viscount Southwell ({{IPAc-en|ˈ|s|ʌ|ð|əl}} {{respell|SUDH|əl}}), of Castle Mattress in the County of Limerick, is a title in the Peerage of Ireland.{{London Gazette| issue = 11679 |page=1 | date = 29 June 1776 }} It was created in 1776 for Thomas Southwell, 3rd Baron Southwell. The Southwell family descends from Thomas Southwell. In 1662 he was created a Baronet, of Castle Mattress in the County of Limerick, in the Baronetage of Ireland. He was succeeded by his son, the second Baronet. He represented County Limerick in the Irish Parliament. In 1717 he was created Baron Southwell, of Castle Mattress, in the County of Limerick, in the Peerage of Ireland.{{London Gazette| issue = 5565 |page=1 | date = 17 August 1717 }} His grandson was the aforementioned third Baron, who was elevated to a viscountcy in 1776. Before succeeding in the barony he had represented Enniscorthy in the Irish House of Commons. His great-grandson, the fourth Viscount, served as Lord Lieutenant of County Leitrim between 1872 and 1878. {{As of|2019}} the titles are held by his great-great-grandson, the eighth Viscount, who succeeded his father in that year.