Captain Edmund Blackadder MC (1871— presumed KIA 1917) was the main character in the fourth and final series of the popular BBC sitcom Blackadder, Blackadder Goes Forth. He was played by Rowan Atkinson.

The fourth series was set in the trenches of the First World War. Naturally, Blackadder spends most of his time trying to get out of the trenches before the insane General Melchett gives him the order to 'climb out of the trenches and walk very slowly towards the enemy' . Blackadder's attempts to escape are opposed by General Melchett, who does not seem to realise the futility of sending men to their deaths and Melchett's aid and desk clerk Captain Darling, who does. Darling and Blackadder have a natural animosity towards one another, since Darling is aware that Blackadder is attempting to avoid his duty, while Blackadder hates Darling for being several miles beyond the front. Darling would gladly see Blackadder mown down by German machine guns although the two bury the hatchet without saying a word when Darling is posted to the front line in the final episode.

Regarding Blackadder's rank, in the episode Goodbyeee..., he says that by 1914 he'd had fifteen years of military experience, so by 1917 he should have been Major Blackadder (although it wouldn't be a stretch to think that he may have been demoted or passed over for promotion).

Captain Blackadder claims to have joined the army in 1888, when "back in those days, if you saw a man in a skirt, you shot him and nicked his country". He joined the 19th/45th East African Rifles, when Britain was fighting colonial wars during the Scramble for Africa and when 'the prerequisite for any battle was that the enemy should under no circumstances carry guns'. He described it as having been 'little more than a travel agency for men with unusually high sex drives'. He was hailed as the 'Hero of Mboto Gorge' in 1892, where he had faced 'ten thousand Watutsi warriors armed to the teeth with kiwi fruit and dry guava halves'. He even saved the life of Douglas Haig (later Field Marshal Douglas Haig) when he was nearly killed by a pygmy woman with a sharpened mango. Blackadder was quite shocked when 500,000 very large, very German, Germans 'hove into view'. At some point before the First World War, Captain Blackadder transferred to the local regiment of Cambridge (either the Cambridgeshire Regiment or the Suffolk Regiment).

Blackadder was, as always, accompanied by Private S. Baldrick, and Lieutenant George. The lack of appreciation for their predicament and general incompetence of George and Baldrick acts as a great hindrance to Blackadder's escape attempts and generally ruin his war.

Continuing the trend of the previous series, he is more intelligent than previous Blackadders. He appears to have a good knowledge of history as he often refers to past events and people, although usually to insult people. His social status is unknown (his ancestry has slowly declined in social status, being originally a Prince, then a Lord, a Butler and then finally a shop owner) but given his rank as a career officer he may be middle class.

He is the only Blackadder seen to have enjoyed romantic success (although all apparently managed to father children): Prince Edmund was found repulsive by women and forced into an arranged marriage with a child, the Elizabethan Lord Blackadder was jilted by his fiancée, Kate (Bob), and ended up consorting with prostitutes and the Prince Regent's butler was led on by Amy Hardwood but found genuinely attractive only by Mrs. Miggins, whom he despised and who in any case eventually eloped with his cousin MacAdder. The Captain's affair with Nurse Mary Fletcher-Brown, though not genuine on his side, was on hers.

Edmund's attempts to avoid going over the top include posing as Italian chefs, with Baldrick as cook (thereby nearly poisoning Melchett and Darling); joining the Royal Flying Corps under Lord Flashheart (not knowing that green pilots had an even worse survival rate); accepting capture by Baron von Richthofen so as to escape through the 'humiliating' punishment of spending the rest of the war teaching home economics in a German convent; working in a British field hospital under "Operation Winkle" (ie:to winkle out the spies); organising a music-hall performance with Lieutenant George as the drag act "Gorgeous Georgina" (this plan was aborted when General Melchett fell madly in love with Georgina and Blackadder was forced to fake "her" death); shooting a homing pigeon caring orders for his company to advance on enemy lines (an act which almost results in his death by firing squad); disregarding an order on the grounds that the telegram was addressed to 'Catpain Blackudder'; pretending that his telephone line to Melchett's office was damaged; and sticking two pencils up his nose, putting his underpants on his head and saying 'Wibble' (Pretending to be mad).

In the final scene of the series, Blackadder shows the first (and, so far, only) sign of bravery from any Blackadder in the series. Finally deciding it would be futile to keep running, he accepts his fate and leads Captain Darling, Lieutenant George and Private Baldrick over the top of the trench and out into no man's land for the 'Big Push'. Blackadder's final recorded words (before "CHARGE!"), standing in the trench with Darling, George and Baldrick (along with the infantry company he commanded in the trench), were "Good luck, everyone." These words from someone who, over the space of four series spanning several centuries, had become known to the public as an egotistical, self-centered, cynical, blunt, sly, thieving, corrupt, villainous, yet curiously likable character, went a long way to underline the serious, sobering mood of this episode. In these last few moments of this momentous sitcom all the clever put-downs, the witty one-liners, the slapstick and the turnip jokes, were pushed aside and the viewers realised that this was no longer a comedy but a harsh, cruel and grim statement of fact. Blackadder is believed to have been KIA after going over the top.

In a 2005 BBC Documentary series showcasing some of Britains favourite sitcoms, The Blackadder edition of the series, presented by John Sergeant, revealed that the original ending of this series had Blackadder, Baldrick, George, Darling and the company under Blackadder's command unambiguously killed.

At the dinner party at the beginning of Blackadder Back and Forth (1999), a portrait of Captain Blackadder is positioned on the wall behind the present Blackadder. See Blackadder Hall.

Captain Blackadder is also has a cameo in The League of Extraordinary Gentlemen: Black Dossier, fighting at the Battle of the Somme.