Best performances in a Hitchcock movie

1. Teresa Wright - Shadow of a Doubt

2. Joan Fontaine - Rebecca
3. Tallulah Bankhead - Lifeboat
4. Ingrid Bergman - Notorious

5. Shirley MacLaine - The Trouble With Harry
6. Barbara Harris - Family Plot
7. James Stewart - Rope


Wright is by far my #1.  2-4 are excellent, my win or near win. #5-7 are other great scene stealers.

Perkins

1) Fontaine Rebecca
2) Stewart Rope
3) Anderson REbecca
4) Grant north by northwest
5) Perkins Psycho
6) Stewart Rear Window
7) Grant Suspicion
8) Olivier Rebecca
9) Fontaine Suspicion
10) Grace Kelly Rear Window
11) Joseph Cotten Shadow of a Doubt
12) Janet Leigh Psycho
13) Teresa Wright Shadow of a Doubt
14) Jessie Royce Landis North by Northwest
15) John Gavin Psycho
16) Rhonda Fleming Spellbound
17) Stewart Vertigo
18) Milland Dial M for murder
19) Novak Vertigo
20) John Dall Rope
21) Diane Baker Marnie
22) Grace Kelly Dial M
23) Briggitte Auber To catch a thief
24) George Sanders Rebecca
25) Gladys Cooper Rebecca
26) Connery Marnie
27) Robert Newton Jamaica Inn
28) Rod Taylor The Birds
29) Jessica Tandy The Birds
30) Alida Valli The Paradine Case
31) Eva Marie Saint North by Northwest
32) Nova Pilbeam The man who knew too much
Probably I forgetting some, films, some I haven't seen. Some I don't think they give mesmering performance.-

Janet Leigh, Psycho
Anthony Perkins, Psycho
Tallulah Bankhead, Lifeboat
James Stewart, Rear Window
James Stewart, Vertigo

HM: Thelma Ritter, Rear Window

Top 10:

Teresa Wright, Shadow of a Doubt
Grant-Bergman-Rains, Notorious ( their rapport is endlessly fascinating)
Laurence Olivier, Rebecca
Tallulah Bankhead, Lifeboat
Eva Marie Saint, North by Northwest
Thelma Ritter, Rear Window
Henry Fonda, The Wrong Man
Anthony Perkins, Psycho

and then of course there's the scene-stealing wonders (Lila Kedrova in Torn Curtain, Florence Bates in Rebecca...) 

Robert Walker in Strangers on a Train is always my go to. I'll give a shoutout to Montgomery Clift in I Confess too.