At first glance, the smartest Avenger would seem to be Tony Stark (Iron Man)... if we judge by charisma, tech, and sarcasm levels. But when it comes to raw intellect and scientific achievements, things aren’t so clear-cut.
Here’s a quick breakdown of the top brains in the Avengers lineup:
1. Reed Richards
(If you count the Fantastic Four as part of the Avengers)

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IQ off the charts.
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Built tech even Stark couldn’t get his head around.
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Frequently referred to as the smartest man on Earth in many Marvel canons.
2. Shuri

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Sister of Black Panther and Wakandan princess with a mind-blowing IQ.
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Designed the Panther suit, healed a critically injured Vision, and masters science, tech, and biotech like a breeze.
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Even Tony and Banner looked slightly… overwhelmed by her in Infinity War.
3. Tony Stark

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Genius, billionaire, playboy, philanthropist.
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Created AI (J.A.R.V.I.S., F.R.I.D.A.Y., Ultron), countless suits, time travel tech, and nanotech.
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His intellect lies in fusing science and engineering with sheer flair.
4. Bruce Banner (Hulk)

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PhD, gamma radiation expert.
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Co-developed time travel and helped bring Vision to life.
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Post–"Smart Hulk" transformation, gained balance... almost.
5. Hank Pym

(Bigger role in comics than on screen)
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Developed shrinking tech, father of the Quantum Realm concept.
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One of the founding Avengers in the comics.
In summary:
In the MCU — Shuri takes the crown for intellect. In the comics — it’s usually Reed Richards. But Tony Stark? Forever in our hearts — if not for pure IQ, then for his iconic blend of brains, boldness, and brilliance.