Yn yr Etholiad cyffredinol cyntaf, ar 28 Chwefror, ni chafodd unrhyw blaid fwyafrif, gan adael senedd grog am y tro cyntaf ers yr Ail Ryfel Byd. Ffurfiodd y Blaid Lafur, dan Harold Wilson, lywodraeth, ac ychydig fisoedd yn ddiweddarach. galwodd etholiad. Y tro hwn, enillodd Llafur fwyafrif bychan o dair sedd.
Etholiad cyffredinol y Deyrnas Unedig, Hydref 1974      |
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| Pob un o'r 635 sedd ar gyfer Tŷ'r Cyffredin.
318 sedd i gael mwyafrif | | Nifer a bleidleisiodd | 72.8% | | | Plaid 1af | Ail blaid | 3ydd plaid | | |  |  |  | | Arweinydd | Harold Wilson | Edward Heath | Jeremy Thorpe | | Plaid | Llafur | Ceidwadwyr | Rhyddfrydwyr | | Arweinydd ers | 14 Chwefror 1963 | 28 Gorffennaf 1965 | 18 January 1967 | | Sedd yr Arweinydd | Huyton | Sidcup | Gogledd Dyfnaint | | Seddi tro yma | 301 sedd, 37.2% | 297 sedd, 37.9% | 14 sedd, 19.3% | | Seddi a gipiwyd | 319 | 277 | 13 | | Newid yn y seddi |  18 |  20 | 1 | | Cyfans. pleidl. | 11,457,079 | 10,462,565 | 5,346,704 | | Canran | 39.2% | 35.8% | 18.3% | | Tuedd | 2% | 2.1% | 1% | |
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| Map o ganlyniad yr etholiad. Y lliwiau'n dynodi'r blaid fuddugol. |
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| 1970 election • MPs |
| February 1974 election • MPs |
| October 1974 election • MPs |
| 1979 election • MPs |
| 1983 election • MPs |
Cafodd Plaid Genedlaethol yr Alban etholiad llwyddiannus iawn, gan ennill 11 sedd, eu cyfanswm mwyaf erioed. Enillodd Plaid Cymru un sedd ychwanegol, Caerfyrddin, a dal eu gafael ar Gaernarfon a Meirionnydd.
| Etholiad cyffredinol y Deyrnas Unedig, Chwefror 1974 |
| Plaid | Seddi | Pleidleisiau | % |
| Plaid Lafur | 319 | 11,457,079 | 39.2 |
| Plaid Geidwadol | 277 | 10,462,565 | 35.8 |
| Plaid Ryddfrydol | 13 | 5,346,704 | 18.3 |
| Plaid Genedlaethol yr Alban | 11 | 839,633 | 2.9 |
| Plaid Undeb Ulster | 6 | 256,065 | 0.9 |
| Plaid Cymru | 3 | 166,321 | 0.6 |
| Social Democratic and Labour Party | 1 | 154,193 | 0.6 |
| Vanguard Progressive Unionist Party | 3 | 92,262 | 0.3 |
| Democratic Unionist Party | 1 | 59,451 | 0.3 |
| Gweriniaethwr Annibynnol (Iwerddon) | 1 | 32,795 | 0.2 |
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