| Winner  Donald TrumpPrimary date April 19, 2016
 
| Poll source | Date | 1st | 2nd | 3rd | Other |  
| Primary results | April 19, 2016 | Donald Trump 60.5%
 | John Kasich 25.1%
 | Ted Cruz 14.5%
 | Other 0.0% |  
| Emerson College[1] Margin of error: ± 5.11%
Sample size: 361
 | April 15 – 17, 2016 | Donald Trump 55%
 | John Kasich 21%
 | Ted Cruz 18%
 | Undecided 5% |  
| CBS News/YouGov[2] Margin of error: ± 5.9%
Sample size: 705
 | April 13 – 15, 2016 | Donald Trump 54%
 | Ted Cruz 21%
 | John Kasich 19%
 | Undecided 6% |  
| Optimus[3] Margin of error: ± 0.822%
Sample size: 14201
 | April 11 – 14, 2016 | Donald Trump 49%
 | John Kasich 23%
 | Ted Cruz 14%
 | Undecided 14% |  
| Gravis Marketing/One America News Network[4] Margin of error: ± 4.5%
Sample size: 481
 | April 13, 2016 | Donald Trump 57%
 | John Kasich 22%
 | Ted Cruz 20%
 |  |  
| NBC News/WSJ/Marist[5] Margin of error: ± 5.5%
Sample size: 313
 | April 10 – 13, 2016 | Donald Trump 54%
 | John Kasich 25%
 | Ted Cruz 16%
 | Undecided 5% |  
| Siena College[6] Margin of error: ± 5%
Sample size: 469
 | April 6 – 11, 2016 | Donald Trump 50%
 | John Kasich 27%
 | Ted Cruz 17%
 | Other 6% |  
| Quinnipiac University[7] Margin of error: ± 4.2%
Sample size: 550
 | April 6 – 11, 2016 | Donald Trump 55%
 | John Kasich 20%
 | Ted Cruz 19%
 | Undecided 6% |  
| Public Policy Polling[8] Margin of error: ± 4.5%
Sample size: 483
 | April 7 – 10, 2016 | Donald Trump 51%
 | John Kasich 25%
 | Ted Cruz 20%
 | Undecided 4% |  
| NBC News/WSJ/Marist[9] Margin of error: ± 6.1%
Sample size: 259
 | April 6 – 10, 2016 | Donald Trump 54%
 | John Kasich 21%
 | Ted Cruz 18%
 | Undecided 5%, Other 1% |  
| Baruch College/New York 1[10] Margin of error: ± 5.8%
Sample size: 324
 | April 5 – 10, 2016 | Donald Trump 60%
 | John Kasich 17%
 | Ted Cruz 14%
 | Undecided 7%, Refused 2% |  
| Liberty Research[11] Margin of error: ± 3.0%
Sample size: 6041
 | April 6 – 7, 2016 | Donald Trump 52%
 | John Kasich 23%
 | Ted Cruz 19%
 | Undecided 6% |  
| Emerson College[12] Margin of error: ± 5.4%
Sample size: 321
 | April 6 – 7, 2016 | Donald Trump 56%
 | Ted Cruz 22%
 | John Kasich 17%
 | Undecided 4%, Other 1% |  
| Fox News[13] Margin of error: ± 4%
Sample size: 602
 | April 4 – 7, 2016 | Donald Trump 54%
 | John Kasich 22%
 | Ted Cruz 15%
 | Undecided 6%, Other 1% |  
| Gravis Marketing/One America News[14] Margin of error: ± 3.3%
Sample size: 857
 | April 5–6, 2016 | Donald Trump 56%
 | John Kasich 24%
 | Ted Cruz 20%
 |  |  
| Monmouth University[15] Margin of error: ± 5.6%
Sample size: 302
 | April 3 – 5, 2016 | Donald Trump 52%
 | John Kasich 25%
 | Ted Cruz 17%
 | Undecided 6% |  
| CBS News/YouGov[16] Margin of error: ± 5.6%
Sample size: 657
 | March 29-April 1, 2016 | Donald Trump 52%
 | Ted Cruz 21%
 | John Kasich 20%
 | Other/Undecided 7% |  
| Quinnipiac University[17] Margin of error: ± 4.6%
Sample size: 457
 | March 22 – 29, 2016 | Donald Trump 56%
 | Ted Cruz 20%
 | John Kasich 19%
 | Undecided 4% |  
| Liberty Research[18] Margin of error: ± 3%
Sample size: 1795
 | March 24 – 26, 2016 | Donald Trump 55%
 | John Kasich 22%
 | Ted Cruz 19%
 | Undecided 4% |  
| Optimus[19] Margin of error: ± 0.8%
Sample size: 14232
 | March 22 – 24, 2016 | Donald Trump 47%
 | John Kasich 22%
 | Ted Cruz 15%
 | Undecided 16% |  
| Emerson College[20] Margin of error: ± 5.6%
Sample size: 298
 | March 14 – 16, 2016 | Donald Trump 64%
 | Ted Cruz 12%
 | John Kasich 1%
 | Other 19%, Undecided 1% |  
| Siena College[21] Margin of error: ± 6.7%
Sample size: 229
 | February 28 – March 3, 2016 | Donald Trump 45%
 | Marco Rubio 18%
 | John Kasich 18%
 | Ted Cruz 11%, Other 1%, Undecided 7% |  
| Siena College[22] Margin of error: ± 7.0%
Sample size: 235
 | January 31 – February 3, 2016 | Donald Trump 34%
 | Ted Cruz 16%
 | Marco Rubio 16%
 | Chris Christie 11%, Jeb Bush 7%, John Kasich 4%, Someone else 2%, Don't know/No opinion 10% |  
| Siena College Margin of error: ± 6.7%
Sample size: 214
 | September 14–17, 2015 | Donald Trump 34%
 | Ben Carson 14%
 | Jeb Bush 11%
 | Chris Christie 9%, Carly Fiorina 8%, Marco Rubio 5%, John Kasich 4%, Ted Cruz 3%, George Pataki 3%, Scott Walker 0%, Other 1%, None of them 5%, Undecided 5% |  
| Quinnipiac University Margin of error: ± 5.2%
Sample size: 356
 | May 28 – June 1, 2015 | George Pataki 11%
 | Marco Rubio 11%
 | Jeb Bush 10%
 | Scott Walker 7%, Ben Carson 6%, Chris Christie 6%, Rand Paul 6%, Donald Trump 6%, Mike Huckabee 5%, Ted Cruz 3%, Carly Fiorina 3%, Rick Santorum 2%, Bobby Jindal 1%, John Kasich 1%, Rick Perry 1%, Lindsey Graham 0%, DK/NA 14%, Wouldn't vote 3%, Someone else 1% |  
| Siena College Margin of error: ± 6.6%
Sample size: 223
 | April 19–23, 2015 | Chris Christie 25%
 | Jeb Bush 20%
 | Marco Rubio 9%
 | Rand Paul 8%, Ted Cruz 6%, Other 8%, Undecided 24% |  
| Quinnipiac University Margin of error: ± 5.4%
Sample size: 327
 | March 11–16, 2015 | Jeb Bush 13%
 | Scott Walker 13%
 | Chris Christie 12%
 | Marco Rubio 10%, Rand Paul 8%, Ben Carson 6%, George Pataki 6%, Ted Cruz 3%, Mike Huckabee 3%, Bobby Jindal 1%, John Kasich 1%, Rick Perry 1%, Rick Santorum 1%, Lindsey Graham 0%, Other 1%, Wouldn't vote 3%, Undecided 18% |  
| Marist College Margin of error: ± 7.6%
Sample size: 167
 | November 18–20, 2013 | Chris Christie 40%
 | Rand Paul 10%
 | Marco Rubio 10%
 | Jeb Bush 8%, Paul Ryan 5%, Ted Cruz 3%, Rick Perry 3%, Scott Walker 3%, Susana Martinez 2%, Rick Santorum 2%, Undecided 15% |  |