S. W. D. Ratnayake

{{Short description|Sri Lankan politician (1901–1986)}}

{{more citations needed|date=August 2017}}

{{Infobox officeholder

| honorific-prefix = Hon.

| name = S. W. D. Rathnayake

| honorific-suffix =

| image =

| constituency_MP = Deniyaya District

| parliament = Ceylon

| majority =

| predecessor = V. G. W. Ratnayake

| successor = P. L. Jinadasa

| term_start = 19 April 1956

| term_end = 5 December 1959

| birth_date = {{birth date|1901|12|05|df=y}}

| birth_place = Deniyaya, Sri Lanka

| death_date ={{death date and age|1986|01|26|1901|12|05|df=y}}

| death_place = Deniyaya, Sri Lanka

| nationality = Sri Lankan

| spouse = A. S. Rathnayake

| party = Sri Lanka Freedom Party

| otherparty =

| relations =Robert Reginald Sepala Rathnayake (father)

| children = S. S. Rathnayake, I. S. Rathnayake

| residence = RathnaShree Walawwa, Bengamuwe, Sri Lanka

| alma_mater = Bengamuwe Central College

| occupation = Proprietary Planter

| profession = teacher

| signature =

| website =

| footnotes=

}}

Sepala William Daineris Rathnayke (5 December 1901 - 26 January 1986) was a Sri Lankan politician.{{cite web|url=https://www.parliament.lk/members-of-parliament/directory-of-past-members/viewMember/2620|title=Hon. Rathnayake, Sepala William Daineris, M.P.|work=Directory of Past Members|publisher=Parliament of Sri Lanka|accessdate=3 August 2017}}

Ratnayke was elected to the Parliament of Ceylon at the 3rd parliamentary election in 1956, representing the Deniyaya electorate, defeating the sitting member, V. G. W. Ratnayake, by 5,460 votes.{{cite web |url=http://www.slelections.gov.lk/web/images/pdf/general-election-results/general-election-1956.pdf |title=Result of Parliamentary General Election 1956 |publisher=Department of Elections, Sri Lanka |accessdate=3 August 2017 }}{{Dead link|date=February 2023 |bot=InternetArchiveBot |fix-attempted=yes }}