| # | Flag | Country | Pupil-teacher ratio, secondaryPupil-teacher ratio, secondary | Year |
|---|---|---|---|---|
| 1 | Ethiopia | 40 | 2012 | |
| 2 | Afghanistan | 38 | 2017 | |
| 3 | Malawi | 37 | 2015 | |
| 4 | Guinea-Bissau | 37 | 2006 | |
| 5 | Mozambique | 36 | 2017 | |
| 6 | Eritrea | 36 | 2017 | |
| 7 | Papua New Guinea | 34 | 2016 | |
| 8 | Kenya | 33 | 2009 | |
| 9 | Guinea | 33 | 2011 | |
| 10 | Bangladesh | 33 | 2017 | |
| 11 | Central African Republic | 31 | 2017 | |
| 12 | Nicaragua | 30 | 2010 | |
| 13 | Niger | 29 | 2017 | |
| 14 | India | 28 | 2016 | |
| 15 | Cambodia | 28 | 2007 | |
| 16 | Gabon | 28 | 1999 | |
| 17 | Burundi | 28 | 2017 | |
| 18 | Nepal | 28 | 2017 | |
| 19 | Vietnam | 28 | 1998 | |
| 20 | South Sudan | 27 | 2015 | |
| 21 | Samoa | 27 | 2016 | |
| 22 | El Salvador | 27 | 2017 | |
| 23 | Chad | 27 | 2016 | |
| 24 | Angola | 26 | 2016 | |
| 25 | Myanmar | 26 | 2017 | |
| 26 | South Africa | 26 | 2016 | |
| 27 | Ivory Coast | 26 | 2017 | |
| 28 | Colombia | 26 | 2017 | |
| 29 | Togo | 26 | 2011 | |
| 30 | Zambia | 25 | 1988 | |
| 31 | Lesotho | 25 | 2017 | |
| 32 | Solomon Islands | 25 | 2012 | |
| 33 | Djibouti | 25 | 2018 | |
| 34 | East Timor | 24 | 2011 | |
| 35 | Namibia | 24 | 2007 | |
| 36 | São Tomé and Príncipe | 24 | 2016 | |
| 37 | Mauritania | 24 | 2017 | |
| 38 | Nauru | 24 | 2016 | |
| 39 | Thailand | 24 | 2017 | |
| 40 | Haiti | 24 | 1984 | |
| 41 | Philippines | 23 | 2016 | |
| 42 | Burkina Faso | 23 | 2017 | |
| 43 | Nigeria | 23 | 2010 | |
| 44 | Zimbabwe | 22 | 2013 | |
| 45 | Sierra Leone | 22 | 2016 | |
| 46 | Yemen | 21 | 1999 | |
| 47 | Ecuador | 21 | 2016 | |
| 48 | Gambia | 20 | 1996 | |
| 49 | Trinidad and Tobago | 20 | 1981 | |
| 50 | Bolivia | 20 | 2017 | |
| 51 | Madagascar | 20 | 2017 | |
| 52 | Vanuatu | 20 | 2015 | |
| 53 | Morocco | 20 | 2017 | |
| 54 | Rwanda | 20 | 2017 | |
| 55 | Guyana | 20 | 2012 | |
| 56 | Fiji | 19 | 2012 | |
| 57 | Equatorial Guinea | 19 | 2005 | |
| 58 | Pakistan | 19 | 2017 | |
| 59 | Iran | 19 | 2017 | |
| 60 | Cameroon | 19 | 2016 | |
| 61 | United Kingdom | 19 | 2016 | |
| 62 | Syria | 18 | 2002 | |
| 63 | Virgin Islands (US) | 18 | 1997 | |
| 64 | Canada | 18 | 1996 | |
| 65 | Republic of the Congo | 18 | 2012 | |
| 66 | Venezuela | 18 | 1987 | |
| 67 | Chile | 18 | 2017 | |
| 68 | Dominican Republic | 18 | 2017 | |
| 69 | Uganda | 18 | 2007 | |
| 70 | Turkey | 18 | 2015 | |
| 71 | Guam | 18 | 1989 | |
| 72 | Laos | 18 | 2017 | |
| 73 | Senegal | 18 | 2017 | |
| 74 | Barbados | 18 | 2017 | |
| 75 | Paraguay | 18 | 2012 | |
| 76 | Puerto Rico | 17 | 2016 | |
| 77 | Algeria | 17 | 1997 | |
| 78 | North Korea | 17 | 2015 | |
| 79 | Tanzania | 17 | 2017 | |
| 80 | Sri Lanka | 17 | 2017 | |
| 81 | Kiribati | 17 | 2008 | |
| 82 | Mali | 17 | 2017 | |
| 83 | Belize | 16 | 2017 | |
| 84 | Brazil | 16 | 2016 | |
| 85 | Honduras | 16 | 2017 | |
| 86 | Ghana | 16 | 2018 | |
| 87 | Mexico | 16 | 2017 | |
| 88 | Indonesia | 15 | 2017 | |
| 89 | Swaziland | 15 | 2016 | |
| 90 | Cape Verde | 15 | 2017 | |
| 91 | Tajikistan | 15 | 2011 | |
| 92 | Liberia | 15 | 2016 | |
| 93 | Palau | 15 | 2000 | |
| 94 | Jamaica | 15 | 2017 | |
| 95 | Aruba | 15 | 2012 | |
| 96 | Egypt | 15 | 2017 | |
| 97 | Panama | 14 | 2016 | |
| 98 | Republic of Ireland | 14 | 1997 | |
| 99 | United States | 14 | 2015 | |
| 100 | Mongolia | 14 | 2010 | |
| 101 | Marshall Islands | 14 | 2003 | |
| 102 | Peru | 14 | 2018 | |
| 103 | French Polynesia | 14 | 1993 | |
| 104 | Tonga | 14 | 2015 | |
| 105 | Democratic Republic Of Congo | 14 | 2015 | |
| 106 | Saint Vincent and the Grenadines | 14 | 2017 | |
| 107 | Netherlands | 14 | 2016 | |
| 108 | San Marino | 14 | 2010 | |
| 109 | Finland | 13 | 2016 | |
| 110 | Iraq | 13 | 2007 | |
| 111 | Tunisia | 13 | 2011 | |
| 112 | American Samoa | 13 | 1992 | |
| 113 | South Korea | 13 | 2016 | |
| 114 | New Zealand | 13 | 2017 | |
| 115 | China | 13 | 2017 | |
| 116 | Botswana | 13 | 2007 | |
| 117 | New Caledonia | 13 | 1997 | |
| 118 | Maldives | 13 | 2003 | |
| 119 | Romania | 12 | 2016 | |
| 120 | Sweden | 12 | 2016 | |
| 121 | Mauritius | 12 | 2017 | |
| 122 | Argentina | 12 | 2008 | |
| 123 | Costa Rica | 12 | 2016 | |
| 124 | Malaysia | 12 | 2017 | |
| 125 | Uruguay | 12 | 2010 | |
| 126 | Germany | 12 | 2016 | |
| 127 | France | 12 | 2013 | |
| 128 | Bulgaria | 12 | 2016 | |
| 129 | Saint Lucia | 11 | 2017 | |
| 130 | Albania | 11 | 2017 | |
| 131 | The Bahamas | 11 | 2016 | |
| 132 | Bhutan | 11 | 2017 | |
| 133 | Czech Republic | 11 | 2013 | |
| 134 | Denmark | 11 | 2014 | |
| 135 | Spain | 11 | 2016 | |
| 136 | Grenada | 11 | 2017 | |
| 137 | Hong Kong | 11 | 2017 | |
| 138 | Jordan | 11 | 2017 | |
| 139 | Japan | 11 | 2016 | |
| 140 | Libya | 11 | 1983 | |
| 141 | Seychelles | 11 | 2017 | |
| 142 | Singapore | 11 | 2016 | |
| 143 | Slovakia | 11 | 2015 | |
| 144 | Suriname | 11 | 2015 | |
| 145 | Bahrain | 10 | 2017 | |
| 146 | Benin | 10 | 2016 | |
| 147 | Uzbekistan | 10 | 2017 | |
| 148 | Guatemala | 10 | 2017 | |
| 149 | Hungary | 10 | 2016 | |
| 150 | Iceland | 10 | 1976 | |
| 151 | Italy | 10 | 2016 | |
| 152 | Cayman Islands | 10 | 2018 | |
| 153 | Kyrgyzstan | 10 | 2017 | |
| 154 | Saudi Arabia | 10 | 2014 | |
| 155 | Cyprus | 10 | 2015 | |
| 156 | Qatar | 10 | 2017 | |
| 157 | Dominica | 10 | 2015 | |
| 158 | Macao | 10 | 2017 | |
| 159 | Poland | 9 | 2016 | |
| 160 | Portugal | 9 | 2016 | |
| 161 | Republic of Macedonia | 9 | 2015 | |
| 162 | Moldova | 9 | 2017 | |
| 163 | Armenia | 9 | 1996 | |
| 164 | Antigua and Barbuda | 9 | 2017 | |
| 165 | Slovenia | 9 | 2016 | |
| 166 | United Arab Emirates | 9 | 2016 | |
| 167 | Liechtenstein | 9 | 2016 | |
| 168 | Turks And Caicos Islands | 9 | 2015 | |
| 169 | Israel | 9 | 2009 | |
| 170 | Cuba | 9 | 2017 | |
| 171 | Switzerland | 9 | 2016 | |
| 172 | Belgium | 9 | 2016 | |
| 173 | Bosnia and Herzegovina | 9 | 2017 | |
| 174 | Austria | 9 | 2017 | |
| 175 | Oman | 9 | 2017 | |
| 176 | Belarus | 8 | 2017 | |
| 177 | Brunei | 8 | 2017 | |
| 178 | Monaco | 8 | 2017 | |
| 179 | Russia | 8 | 2012 | |
| 180 | Greece | 8 | 2016 | |
| 181 | Serbia | 8 | 2017 | |
| 182 | Estonia | 8 | 2016 | |
| 183 | Tuvalu | 8 | 2016 | |
| 184 | Luxembourg | 8 | 2016 | |
| 185 | Latvia | 8 | 2016 | |
| 186 | Norway | 8 | 2016 | |
| 187 | Andorra | 8 | 2017 | |
| 188 | Virgin Islands (British) | 8 | 2017 | |
| 189 | Lebanon | 7 | 2017 | |
| 190 | Georgia | 7 | 2017 | |
| 191 | Ukraine | 7 | 2017 | |
| 192 | Lithuania | 7 | 2016 | |
| 193 | Malta | 7 | 2016 | |
| 194 | Saint Kitts And Nevis | 7 | 2016 | |
| 195 | Kuwait | 7 | 2015 | |
| 196 | Sint Maarten | 7 | 2014 | |
| 197 | Kazakhstan | 6 | 2018 | |
| 198 | Croatia | 6 | 2016 | |
| 199 | Bermuda | 6 | 2015 | |
| 200 | Comoros | 5 | 2017 |