| Cabinet Name: | Second Shadow Cabinet of Harold Wilson |
| Cabinet Type: | Shadow Cabinet |
| Jurisdiction: | the United Kingdom |
| Flag Border: | true |
| Incumbent: | 1970 – 1974 |
| Date Formed: | 19 June 1970 |
| Date Dissolved: | 4 March 1974 |
| Government Head Title: | Leader of the Opposition |
| Government Head: | Harold Wilson |
| Other Government Minister Title: | Shadow Deputy Prime Minister |
| State Head Title: | Monarch |
| State Head: | Elizabeth II |
| Election: | 1970 United Kingdom general election |
| Legislature Term: | 45th UK Parliament |
| Previous: | First Shadow Cabinet of Edward Heath |
| Successor: | Second Shadow Cabinet of Edward Heath |
| Deputy Government Head: | Roy Jenkins (1970-72) Edward Short (1972-74) |
| Deputy Government Head Title: | Deputy Leader of the Opposition |
Harold Wilson of the Labour Party formed his Second Shadow Cabinet as Leader of Her Majesty's Most Loyal Opposition after losing the 1970 general election to Conservative Edward Heath. He retained leadership of the Opposition for the length of the Heath Ministry from 1970 to 1974. In February 1974, his party narrowly won an election. Wilson was then forced to form a minority government that lasted only until another election in October of that year. Following that election, Wilson formed a majority government.