Hit wicket is a method of dismissal in the sport of cricket. This method of dismissal is governed by Law 35 of the laws of cricket. The striker is out "hit wicket" if, after the bowler has entered his delivery stride and while the ball is in play, his wicket is put down by his bat or his person. The striker may do this whilst preparing to receive or receiving a delivery or in setting off for his first run after playing the delivery. In simple language, if the striking batsman knocks the bails off the stumps or uproots the stumps, while attempting to hit the ball or take off for a run, he is out hit wicket.
This method is the sixth most common method of dismissal after caught, bowled, leg before wicket, run out and stumped. It is significantly rarer than any of these, which constitute the five conventional methods, but still much more common than the other five (timed out, handled the ball, obstructing the field, retired out and hit the ball twice), which are extremely rare.
Although a bowler is given credit for the wicket, it is not a method of dismissal that a bowler actively seeks. A batsman may not be given out "hit wicket" if the ball is not actually delivered by the bowler or if the delivery is a no ball.
Due to the rarity of this method of dismissal, most occurrences in international cricket are notable.
On 9 August 1991, during a match between England and the West Indies at the Oval, Ian Botham fell over his stumps whilst attempting to hook Curtly Ambrose and so was dismissed "hit wicket". Later in the day, Brian Johnston of BBC Radio's Test Match Special read out the details of the scorecard as normal. When he came to Botham's dismissal, his fellow presenter Jonathan Agnew commented that Botham 'just didn't quite get his leg over'. This was a double entendre meaning that he was not able to avoid hitting his stumps by getting his leg higher than the stumps, and also a reference to sex. Johnston slowly started laughing until he could commentate no more, leaving about a minute of broadcasting being just him in a fit of giggles.
In the first innings of the 3rd Test in the 1921 Ashes series, at Headingley, Andy Ducat, playing in his only Test for England, fended at a fast ball bowled by Australia's Ted McDonald. Ducat's bat broke, and a splinter flew back and dislodged a bail, the ball being caught behind by a slip fielder. Ducat was given out "caught", although it seems likely that he could also have been given out "hit wicket".
Later in 1921, in the 2nd Test between Australia and South Africa at Old Wanderers in Johannesburg, McDonald dismissed Billy Zulch in a similar fashion, breaking the batsman's bat so that fragments flew back to dislodge a bail, and Zulch was given out "hit wicket".
After these incidents, the MCC clarified that whole bat must break the wicket for the batsman to be given out "hit wicket". However, effective 1 October 2010, this law has been changed to allow a batsman to be dismissed "hit wicket" if a splinter, or part of his bat, breaks the wicket.
Playing for Surrey against Derbyshire at the Oval in 1953, Alan Revill's hand was hit by a lifting delivery from Alec Bedser. Revill shook his hand in pain, and his glove flew off, hit the stumps, and dislodged a bail. The umpire considered that Revill was still "playing at the ball", and he was dismissed "hit wicket".
In Test cricket, four batsmen have been out "hit wicket" as a result of headgear falling onto the stumps.
In the 2nd Test between Australia and the West Indies at the MCG in 1960–61 (the Test immediately after the famous Tied Test at Brisbane), Joe Solomon was first out in the second innings, following on. Playing back to a topspinner bowled by Richie Benaud, his cap fell off and dislodged a bail, so he was out "hit wicket".  The Australian crowd thought the dismissal was unsporting, and booed their own side.
Two Indian cricketers have been dismissed in a similar fashion – Ashok Mankad by England's Chris Old during the 3rd Test at Edgbaston in July 1974,  and Dilip Vengsarkar by Australia's Jeff Thomson during the 1st Test at Brisbane in December 1977.
In the 3rd Test between England and West Indies at Old Trafford on 9 June 2007, Kevin Pietersen was out "hit wicket" when his helmet fell onto the stumps. The bowler was Dwayne Bravo, who bowled a good bouncer that dislodged the helmet. Replays suggested that the force of the ball broke the chinstrap, freeing the lid to strike the stumps.
In the 3rd One Day International between New Zealand and Australia in Dunedin in February 2000, New Zealand's Adam Parore had his helmet knocked off by a short-pitched delivery from Brett Lee. The helmet fell into the stumps, and Parore was also out "hit wicket", causing some disturbance in the crowd. 
Pakistan's Inzamam-ul-Haq was also out "hit wicket" in the 3rd Test against England at Headingley on 6 August 2006, as he attempted to sweep England spinner Monty Panesar and in doing so lost his balance before falling backwards onto his stumps. He attempted to jump over the stumps, but completely fell on top of them.
The first dismissal "hit wicket" in international Twenty20 took place on 12 September 2007, in an ICC World Twenty20 match between Kenya and New Zealand, when New Zealand's Mark Gillespie pitched a ball just short of a length which swung back into Kenya's David Obuya from outside off stump and pushed him back into his crease, causing him to lose his balance and tread on his stumps.
The second such dismissal occurred on 11 January 2009 in a match between Australia and South Africa, when a ball from Australia's Shaun Tait hit South Africa's AB de Villiers on the hip, causing him to fall back and resulting in his bat dislodging the off bail.
The most recent and one of the more bizarre hit wicket dismissals was of Sri Lanka national cricket team captain Kumar Sangakkara in the finals of the triangular ODI Compaq Cup against India at Colombo on 14 September 2009, as he attempted a shot and in the follow through his bat slipped out of his hands, flew backwards in the air and landed on the stumps.
In the Twenty 20 international at AMI Stadium on 28 February 2010, Black Caps Wicket Keeper Gareth Hopkins swung a ball down the leg side for a four, yet stepped back on his stumps in the process of doing so.
In IPL 2012 Chennai Super Kings vs Deccan Charges Ravindra Jadeja coincidental stroke his bat off to the stumps leading the off stump to fall down and after the end off delivery was declared OUT.
In January 1998, South Africa were pushing for victory in the 3rd and final Test against Australia at the Adelaide Oval in an attempt to square the series. Mark Waugh was attempting to hold off the South African bowlers for a draw with only tail-end support remaining. He was hit in the arm by a short ball from Shaun Pollock, and upon walking away from the wicket between deliveries, dislodged the bails with his bat. The South African appeal for "hit wicket" was turned down, and Waugh went on to secure the draw which won the series for Australia. South African captain Hansie Cronje later speared the umpires' dressing room door with a stump.
- BBC Sport Brian Johnston and Jonathan Agnew of BBC radio's Test Match Special discussing Ian Botham's dismissal 'Hit wicket'.
- Gerald Brodribb, Next Man In, Chapter 35, Souvenir Press (1995)
- List of cricketers Dismissed Hit wicket in tests
- List of cricketers Dismissed Hit wicket in Odis