Hawkwitch

Hawkwitch is the het ship between Clint Barton and Wanda Maximoff from the Marvel Cinematic Universe fandom.

Canon
Clint and Wanda were initially enemies; he was a member of the Avengers and a rival of her brother Pietro. When she attempted to sneak up behind him with a spell, Clint shocked Wanda with one of his arrows. After recovering from this, she retaliated by infecting the Hulk and making him nearly unstoppable.

After Wanda and Pietro turned on Ultron, he responded by raising Sokovia into the sky. Clint comforted Wanda after this, reassuring her that life as a superhero wasn't supposed to be easy. The two of them protected the citizens of Sokovia and helped evacuate the floating city before it dropped.

After the Sokovia Accords went into effect, Clint was sent by Steve Rogers to recruit Wanda. They got into a brief fight with Vision, who she was able to non-fatally subdue. They then fought alongside the rest of Captain America's team and were arrested for resisting the Accords.

The two friends reunited after Tony Stark's funeral, where they discussed losing Natasha Romanoff and Vision. This scene highlights how similar they are: people who are very protective of their families and have gone through loss.

Quotes
"It doesn't matter what you did, or what you were. If you go out there, you fight, and you fight to kill. Stay in here, you're good. I'll send your brother to come find you. But if you step out that door, you are an Avenger."

- Clint reassures Wanda

"Vision, that's enough. Let him go, I'm leaving."

- Wanda defends Clint from Vision

"You're pulling your punches."

- Wanda after saving Clint's life

Fanon
Hawkwitch is a semi-rare pairing considering they don't interact much in the various films. Some fanfics involving them have featured Pietro as well, considering his relationship with Clint.

Fandom
Clint/Wanda tag on AO3

Trivia

 * To honour Wanda's brother, who died saving Clint's life, he decided to name his newborn son, Nathaniel Pietro Barton, after him.