Of all the movies I've seen, there aren't a whole of performances that really blew me away, so if I had to pick three favorites:

Linda Hamilton in Terminator 2: Judgment Day
Joaquin Phoenix in Joker
Tim Curry in The Rocky Horror Picture Show

Just one honorable mention is too tough, so I'll go with 5-ish:

The Mom and the Drunk Lady in The Bad Seed
Toni Collette in Hereditary
John Dunsworth in Trailer Park Boys
Jack Nicholson in Cuckoo's Nest/The Shining
Tom Hardy in Bronson

Jonathan Frid as Barnabas Collins
Don Knotts as Barney Fife
Christopher Reeve as Superman

2-way tie for honorable mention goes to Peter Dinklange's Tyrion Lannister & Bryan Cranston's Walter White, simply for how nicely they evolved their characters over time.

Movies

In no particular order:
Daniel Day Lew in There will be Blood
Johny Depp in Fear and Loathing in Las Vegas
Humphrey Bogart in The Treasure of the Siera Madre

Honorable Mentions
Jaquine Phoenix in the Joker
Robert De' Niro in Taxi Driver
James Stewart in It's a Wonderful Life
Ralph Fiennes in Schindler's List

TV Shows

John Dunsworth in Trailer Park Boys
Charlie Hunnam in Sons of Anarchy
Kyle MacLachlan in Twin Peaks

Honorable Mentions
David Lynch in Twin Peaks
Michael C. Hall in Dexter
Rob McElhenney in It's Always Sunny in Philidelphia
Burgess Meredith in The Twilight Zone

1. Jack Nicholson in The Shining
2. Robert Shaw in Jaws
3. Malcolm McDowell in A Clockwork Orange

Humphrey Bogart - Casablanca
Peter Sellers - Dr Strangelove
David Duchovny - Xfiles

Hm: Christian Bale - American Psycho

Humphrey Bogart is amazing. I'd fuck him.

Yeah I really could have used him for a bunch of films.

Jodie Foster in The Little Girl Living down the Lane (1976)
Ivana Baquero in Pan's Labyrinth (2006)

Abgail Breslin in pretty much everything she is in but if I need to make a pick: Maggie (2015)

Also
Sissy Spacek in Carrie (1976)
Lon Chaney in all his movies especially The Phantom of the Opera (1925)
Conrad Veidt especially in Orlac's hands (1924)

Vincent Price well I just can't pick they are all good

David Bowie in The Man Who Fell to Earth (1976)

Oh come on how can you not pick his performance in Labyrinth

I almost did . I had to go with The Man Who Fell to Earth. It was a close call though.

Nah, his best performance is in Merry Christmas Mr. Lawrence.

Juliette Binoche in Three Colours: Blue (1993).
Richard E. Grant in Withnail & I (1987).
Jodie Foster and Robert De Niro in Taxi Driver (1976).

Honourable mention:

Malcolm McDowell in A Clockwork Orange (1971)

For TV, I'd go with both of Troma's picks too.

I'm sure there are countless others I could pick.