Easiest to Hardest
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King Slime. I swear this guy is on some next-level sedatives because as long as you have Hermes's Boots, this guy can't for the life of him keep up with you. He has no projectiles to hit you and as long as you're not walking towards the damn thing it should never be able to hit you. Like seriously; Does this guy even WANT to fight you? I have more trouble with the slimes it spawns than the boss itself. Next.
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Lunatic Cultist. You know, this guy WOULD actually pose a threat if he could last long enough to deal damage. Unfortunately, with the weapons that are available Post-Golem, this guy doesn't stand a chance. I have genuinely had a playthrough where I killed him with in less than 10 seconds with gear you could get before killing him. Either this guy's meant to be a pushover, or the devs really just do not understand how powerful Post-Golem gear is.
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Skeletron. I know, I know, this guy can be scary sometimes, but I have a few words to say about him, and they are: Hermes, Frog Leg, Blizzard. Yep. That's it. You can remove your hearing aids because that's all you really need to kill this guy. simple Hermes's Boots can outrun his head, and with just a Frog Leg and a Blizzard in a Balloon you can easily circle his head when he starts shooting skulls. And be prepared to circle him most of the time, because his hands are about as durable as the lead in my mechanical

ing pencil. It has been literal years since I last died to this boss in a mode that didn't kill me in half of a hit.
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Destroyer. I genuinely don't know how to rank this boss. If you have the right stuff, you can put on a blindfold and fire rubber bands at your keyboard from ten feet away and still will probably win. On the other hand, if you lack the proper gear then almost no amount of Blood, sweat, nor tears can actually put a dent in this thing. Although, most classes do have pretty easy ways to deal with him, and with proper use of those he's usually pretty doable
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Golem. This boss is not hard. He can barely move (to be fair, his chamber prevents you from moving too much as well), He dies insanely fast, and if the devs didn't tell us what changes they made to him in 1.4, we'd never have figured out what they actually were. This boss is a joke. And for the love of god please make him stay that way, because if FTW taught us anything, it's that making this boss an actual challenge is the biggest mistake since the deities above thought to create mankind.
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Eye of Cthulhu.
Skybridge.
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Skeletron Prime. 4 arms means 4 sources of danger, right? Ehh... 3 of his arms don't really exist, and his laser can be scary at times, but once it's down, the fight is over. I do not want to hear you tell me that he's challenging to take down before dawn, because you can take this guy down in Master Mode with a Minishark, Orichalcum Armor, and Crystal Bullets. I have seen it happen.
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Brain of Cthulhu. Imagine being so weak that you hide inside your invincible shell and throw your children at whatever happens to be in your general vicinity. Congratulations; You just imagined the Brain of Cthulhu! Wait am I missing a phase? Hmm.... Wait, he comes out after you kill his offspring? Interesting. I wonder if that makes the fight any harder.
I'm going to tell you right now it doesn't. I beat his second phase first try in Master Mode with a Ruler. A ruler. I killed this boss with a measuring implement, and the difficulty bar on this phase doesn't even reach the first milimeter mark.
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Eater of Worlds. Vilethorn and Ball O' Hurt make this boss a joke. I wonder where you get those from.
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Queen Bee. Finally! A good boss! I mean, it's really easy, but it's still a good fight. I have never seen her bees take more than one hit to kill. Vilethorn her

while she releases them and listen to the absolute cacophony of squelching death sounds as millions of her offspring die the instant they spawn. The rest of her fight isn't much harder. Her dash is countered by the age old technique of
jumping, and her stingers are dodged simply by running the

away from them.
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Wall of Flesh. This boss is a DPS race. Straight-up. The only hard part of it is trying to actually hit him while he's offscreen. If you DO manage to hit him, you can experience the joy of watching his health bar melt.
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Queen Slime. Welcome to the Big Boy fights. Named
BBF because I can't be assed to think of a better name. This boss really doesn't know how to play tag. Her minions are practically immobile too. Oh. I forgot: She has a second phase. And the age old proverb of "You can make anything scarier by adding wings to it" certainly holds true, because holy moly this thing will clobber if you don't know what you're doing. Her minions pack a hell of a punch and have huge cases of ammunition hidden uh... somewhere, because these

s
do not stop shooting.
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Duke Fishron. This boss is a noobtrap. He deals enough damage to smash through your overprotective mother's 17 separate passwords for her email, and has enough speed to make newer players genuinely baffled at his aggression. That aggression quickly turns into a downside though, since he frequently needs to stop for a bit and catch his breath. His Sharknadoes may SOUND dangerous, but they don't move... and you can. You have no excuse to run into these. Once you learn this boss he's a piece of cake.
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The Twins. "Covering for your partner's weaknesses" could never be more true than in this fight, because at any given time at least one of these guys can't seem to figure out what the hell they had for breakfast, much less how to put up an actual fight. Spazmatism's second phase features a truckload of absolutely nothing threatening, and Retinazer's first phase could probably be removed from the fight and you wouldn't notice a difference. But when these bosses get going,
boy do they get going
(Okay I know this is almost certainly unintentional but can we talk about how Retinazer in second phase will wait patiently for you to come out if you enter your house? This absolute chad doesn't even fire his laser because he can't bear to damage your house. What a Gentleman.)
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Plantera. What on Gaia's green bosom is this god-forsaken abomination? Her first phase
physically cannot hit you if you circle her, and she fires her seeds so rapidly that doing
anything but circle her is pretty much impossible. You literally cannot make this phase hard for yourself.
Then she shatters her pretty pink bulb and becomes the worst boss in the game.
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Empress. This is the best boss in the game. Lower your hands. This is what every Terraria boss should strive to be: Challenging, rewarding, and
masterable. Her attacks are highly dangerous and the prettiest thing in the game to look at. Her attacks deal some incredible damage and cover a huge amount of space. But they're all in a set pattern, and I've fought this boss so many times I could recite it in my sleep.
(Unrelated but anyone who tells you this boss is a Bullet Hell has never actually played a Bullet Hell. This boss is nowhere near a Bullet Hell.)
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Moon Lord. Forget second phase Plantera. This boss's second phase is the epitome of unfair. A line of projectiles whose telegraph is always offscreen? Check! A deathray that you literally can't see nor dodge because the True Eye firing it doesn't give a

where they are in relation to you? Check.
This is the worst boss in the game from an objective design standpoint. I don't care how cool he is thematically, or how epic his music is, or how nice he is to look at, this bossfight
blows.