1986 Thai general election
{{Infobox legislative election
| country = Thailand
| previous_election = 1983
| next_election = 1988
| seats_for_election = All 347 seats in the House of Representatives
| majority_seats = 174
| election_date = 27 July 1986
| registered = 26,160,100
| turnout = 61.43% ({{increase}} 10.67pp)
| party1 = Democrat Party (Thailand) | leader1 = Bhichai Rattakul | percentage1 = 22.52 | seats1 = 100 | last_election1 = 56
| party2 = Thai Nation Party | leader2 = Pramarn Adireksarn | percentage2 = 17.26 | seats2 = 63 | last_election2 = 73
| party3 = Social Action Party | leader3 = Siddhi Savetsila | percentage3 = 12.12 | seats3 = 51 | last_election3 = 92
| party4 = United Democrat Party | leader4 = Kriangsak Chamanan | percentage4 = 10.13 | seats4 = 38 | last_election4 = New
| party5 = People Party (Thailand) | leader5 = | percentage5 = 7.40 | seats5 = 18 | last_election5 = New
| party6 = Thai Citizen Party | leader6 = Samak Sundaravej | percentage6 = 6.94 | seats6 = 24 | last_election6 = 36
| party7 = Community Action | leader7 = | percentage7 = 6.03 | seats7 = 15 | last_election7 = New
| party8 = Progress Party (Thailand, 1983) | leader8 = Uthai Pimjaichon | percentage8 = 5.31 | seats8 = 9 | last_election8 = 3
| party9 = Ruam Thai | leader9 = Narong Wongwan | percentage9 = 4.41 | seats9 = 19 | last_election9 = New
| party10 = National Democrat Party (Thailand) | leader10 = | percentage10 = 2.86 | seats10 = 3 | last_election10 = 15
| party11 = Mass Party | leader11 = | percentage11 = 1.92 | seats11 = 3 | last_election11 = New
| party12 = Liberal Party (Thailand) | leader12 = Narong Kittikachorn | percentage12 = 1.08 | seats12 = 1 | last_election12 = New
| party13 = Labour Democrat Party | leader13 = | percentage13 = 0.65 | seats13 = 1 | last_election13 = 0
| party14 = New Force Party | leader14 = Krasae Chanawongse | percentage14 = 0.62 | seats14 = 1 | last_election14 = 0
| party15 = Thai People Party | leader15 = | percentage15 = 0.52 | seats15 = 1 | last_election15 = 4
| title = Prime Minister
| before_election = Prem Tinsulanonda
| before_party = Independent politician
| after_election = Prem Tinsulanonda
| after_party = Independent politician
}}
General elections were held in Thailand on 27 July 1986. The Democrat Party emerged as the largest party, winning 100 of the 347 seats. Voter turnout was 61%.Dieter Nohlen, Florian Grotz & Christof Hartmann (2001) Elections in Asia: A data handbook, Volume II, p286 {{ISBN|0-19-924959-8}}
Results
{{Election results
|image=File:15th Thailand House of Representatives.svg
|party1=Democrat Party|votes1=8477701|seats1=100|sc1=+44
|party2=Thai Nation Party|votes2=6496370|seats2=63|sc2=–10
|party3=Social Action Party|votes3=4560615|seats3=51|sc3=–41
|party4=United Democrat Party|votes4=3814651|seats4=38|sc4=New
|party5=People Party|votes5=2786105|seats5=18|sc5=New
|party6=Thai Citizen Party|votes6=2612717|seats6=24|sc6=–12
|party7=Community Action|votes7=2268346|seats7=15|sc7=New
|party8=Progress Party|votes8=1998721|seats8=9|sc8=+6
|party9=Ruam Thai Party|votes9=1658812|seats9=19|sc9=New
|party10=National Democrat Party|votes10=1078128|seats10=3|sc10=–12
|party11=Mass Party|votes11=723758|seats11=3|sc11=New
|party12=Liberal Party|votes12=404960|seats12=1|sc12=New
|party13=Labour Democrat Party|votes13=246512|seats13=1|sc13=+1
|party14=New Force Party|votes14=232027|seats14=1|sc14=+1
|party15=Thai People Party|votes15=196527|seats15=1|sc15=–3
|party16=Rak Thai|votes16=85241|seats16=0|sc16=New
|total_sc=+23
|valid=15506897
|invalid=564060
|electorate=26160100
|source=Nohlen et al.
}}