Indicates the country has legalized same-sex marriage nationwide
| Country | Pollster | Year | For | Against | Don't Know/Neutral/No answer/Other | Source |
|---|---|---|---|---|---|---|
| ILGA | 2016 | 10% | 71% | 20% | [68] | |
| Ipsos | 2015 | 59% | 26% | 15% | [69] | |
| Pew Research Center | 2017 | 3% | 96% | 1% | [70] | |
| Ipsos | 2015 | 69% | 25% | 6% | [71] | |
| IMAS | 2015 | 55% | 38% | 7% | [72] | |
| Public Domain | 2014 | 7% | 90% | 3% | [73] | |
| Pew Research Center | 2017 | 16% | 81% | 3% | [70] | |
| Vanderbilt University | 2010 | 18% | 82% | - | [74] | |
| Eurobarometer | 2015 | 77% | 20% | 3% | [75] | |
| Global Research | 2016 | 41% | 49% | 10% | [76] | |
| Pew Research Center | 2017 | 13% | 84% | 4% | [70] | |
| Ipsos | 2015 | 40% | 43% | 17% | [69] | |
| Pew Research Center | 2014 | 22% | 67% | 11% | [77] | |
| Pew Research Center | 2017 | 18% | 79% | 3% | [70] | |
| Forum Research | 2015 | 70% | 22% | 8% | [78] | |
| Plaza Pública Cadem | 2017 | 64% | 32% | 4% | [79] | |
| ILGA | 2016 | 31% | 30% | 39% | [68] | |
| Gallup | 2016 | 40% | 57% | 3% | [80] | |
| Pew Research Center | 2014 | 29% | 61% | 10% | [77] | |
| Pew Research Center | 2017 | 31% | 64% | 6% | [70] | |
| Eurobarometer | 2015 | 37% | 56% | 7% | [75] | |
| Pew Research Center | 2017 | 65% | 29% | 6% | [70] | |
| Eurobarometer | 2015 | 87% | 9% | 4% | [75] | |
| Pew Research Center | 2014 | 25% | 72% | 3% | [77] | |
| Pew Research Center | 2014 | 16% | 74% | 10% | [77] | |
| ILGA | 2016 | 16% | 58% | 26% | [68] | |
| Pew Research Center | 2014 | 11% | 81% | 8% | [77] | |
| Pew Research Center | 2017 | 23% | 71% | 5% | [70] | |
| Eurobarometer | 2015 | 66% | 28% | 6% | [75] | |
| BVA | 2015 | 67% | 31% | 2% | [81] | |
| Pew Research Center | 2017 | 3% | 95% | 2% | [70] | |
| YouGov | 2017 | 66% | 26% | 8% | [82] | |
| ILGA | 2016 | 20% | 60% | 20% | [68] | |
| FocusBari | 2015 | 56% | 35% | 9% | [83] | |
| Pew Research Center | 2014 | 12% | 82% | 6% | [77] | |
| CADRES | 2013 | 14% | 76% | 10% | [84] | |
| Baròmetro de las Américas por LAPOP | 2014 | 6.7% | - | - | [85] | |
| Pew Research Center | 2014 | 13% | 83% | 4% | [77] | |
| Pew Research Center | 2017 | 27% | 64% | 9% | [70] | |
| Gallup | 2004 | 87% | - | - | [86] | |
| ILGA | 2016 | 35% | 35% | 30% | [68] | |
| ILGA | 2016 | 14% | 69% | 17% | [68] | |
| ILGA | 2016 | 64% | 18% | 18% | [68] | |
| ILGA | 2016 | 49% | 27% | 24% | [68] | |
| Demos & Pi | 2016 | 56% | 40% | 4% | [87] | |
| ILGA | 2016 | 22% | 50% | 28% | [68] | |
| ILGA | 2016 | 16% | 54% | 30% | [68] | |
| ILGA | 2016 | 33% | 27% | 40% | [68] | |
| ILGA | 2016 | 14% | 62% | 23% | [68] | |
| Pew Research Center | 2017 | 7% | 89% | 4% | [70] | |
| ILGA | 2016 | 21% | 62% | 17% | [68] | |
| Pew Research Center | 2017 | 16% | 77% | 7% | [70] | |
| Pew Research Center | 2017 | 12% | 85% | 4% | [70] | |
| Eurobarometer | 2015 | 75% | 20% | 5% | [75] | |
| ILGA | 2016 | 30% | 47% | 23% | [68] | |
| Eurobarometer | 2015 | 65% | 29% | 6% | [75] | |
| Gabinete de Comunicación Estratégica | 2016 | 69% | 25% | 6% | [88] | |
| Pew Research Center | 2017 | 5% | 92% | 3% | [70] | |
| ILGA | 2016 | 14% | 65% | 21% | [68] | |
| ILGA | 2016 | 64% | 19% | 17% | [68] | |
| ILGA | 2016 | 57% | 22% | 21% | [68] | |
| Pew Research Center | 2014 | 16% | 77% | 7% | [77] | |
| ILGA | 2016 | 21% | 62% | 18% | [68] | |
| Ipsos | 2013 | 78% | 17% | 4% | [89] | |
| ILGA | 2016 | 30% | 51% | 19% | [68] | |
| Pew Research Center | 2014 | 23% | 72% | 5% | [77] | |
| Pew Research Center | 2014 | 15% | 80% | 5% | [77] | |
| CPI | 2017 | 13% | 82% | 4% | [90] | |
| ILGA | 2016 | 25% | 52% | 24% | [68] | |
| Pew Research Center | 2017 | 32% | 59% | 8% | [70] | |
| ILGA | 2016 | 53% | 27% | 21% | [68] | |
| Pew Research Center | 2017 | 26% | 74% | 1% | [70] | |
| Pew Research Center | 2017 | 5% | 90% | 5% | [70] | |
| ILGA | 2016 | 18% | 58% | 24% | [68] | |
| Pew Research Center | 2017 | 12% | 83% | 4% | [70] | |
| OSC | 2013 | 21% | 55% | 24% | [91] | |
| Eurobarometer | 2015 | 24% | 69% | 7% | [75] | |
| Ninamedia | 2015 | 38% | 50% | 12% | [92] | |
| Ipsos | 2015 | 45% | 40% | 15% | [69] | |
| Ipsos | 2015 | 27% | 55% | 18% | [69] | |
| ILGA | 2016 | 63% | 20% | 17% | [68] | |
| ILGA | 2014 | 29% | 43% | 29% | [93] | |
| Vanderbilt University | 2010 | 20% | 80% | - | [94] | |
| Eurobarometer | 2015 | 90% | 7% | 3% | [75] | |
| Pink Cross | 2016 | 69% | 25% | 6% | [95] | |
| ILGA | 2014 | 21% | 56% | 24% | [93] | |
| Taiwan Social Change Survey | 2015 | 54% | 37% | 9% | [96] | |
| NIDA Poll | 2015 | 59% | 35% | 6% | [97] | |
| ILGA | 2016 | 22% | 50% | 29% | [68] | |
| ILGA | 2014 | 18% | 62% | 21% | [93] | |
| ILGA | 2016 | 17% | 59% | 23% | [68] | |
| ILGA | 2016 | 15% | 63% | 22% | [68] | |
| Pew Research Center | 2017 | 9% | 85% | 6% | [70] | |
| ILGA | 2016 | 19% | 59% | 22% | [68] | |
| ILGA | 2016 | 48% | 29% | 23% | [68] | |
| Gallup | 2017 | 64% | 34% | 2% | [98] | |
| Baròmetro de las Américas por LAPOP | 2014 | 70.6% | - | - | [99] | |
| Pew Research Center | 2014 | 28% | 61% | 11% | [77] | |
| ILGA | 2016 | 45% | 25% | 30% | [68] | |
| ILGA | 2016 | 19% | 59% | 22% | [68] |