Lengste elvar i Storbritannia

mini|Themsen i London.
Dette er ei liste over dei lengste elvane i Storbritannia. 
<tr><th> <th>Elv<th>Lengd (km)
<tr><td>1<td>SevernRivers and the British Landscape, (2005), Sue Owen et al., Carnegie Publishing, ISBN 978-1-85936-120-7<td>354
<tr><td>2<td>Themsen<td>346
<tr><td>3<td>Trent<td>297
<tr><td>4<td>Great Ouse<td>230
<tr><td>5<td>Wye<td>215
<tr><td>6<td>Ure/Ouse i Yorkshire<td>208
<tr><td>7<td>Tay<td>188
<tr><td>8<td>Spey<td>172
<tr><td>9<td>Clyde<td>172
<tr><td>10<td>Nene<td>161
<tr><td>11<td>Tweed<td>155
<tr><td>12<td>Avon i Warwickshire<td>154
<tr><td>13<td>Eden i Cumbria<td>145
<tr><td>14<td>Dee i Aberdeenshire<td>140
<tr><td>15<td>Witham<td>132
<tr><td>16<td>Teme<td>130
<tr><td>17<td>Don i Aberdeenshire<td>129
<tr><td>18<td>Bann<td>122
<tr><td>=19<td>Ribble<td>120
<tr><td>=19<td>Avon i Bristol<td>120
<tr><td>21<td>Tyne<td>118
<tr><td>22<td>Derwent i Yorkshire<td>115
<tr><td>=23<td>Aire<td>114
<tr><td>=23<td>Nith<td>114
<tr><td>=25<td>Tees<td>113
<tr><td>=25<td>Medway<td>113
<tr><td>=25<td>Mersey<td>113
<tr><td>=28<td>Dee i Wales<td>112
<tr><td>=28<td>Don i South Yorkshire<td>112

Kjelder
Denne artikkelen bygger på «Longest rivers of the United Kingdom» frå ,  den 3. juli 2011. 
 oppgav desse kjeldene: