Outside of Super Bowl Sunday, it doesn’t get much bigger in the online sports betting world than March Madness. With 67 games over a three-week span in a one-and-done setting—and plenty of wild finishes and upsets—it’s a bettor’s paradise. 

Beyond just the games, it’s also a great opportunity for those same bettors to earn a number of great sportsbook promo codes that unlock welcome bonuses when used during registration. 

As you get ready to sign up at these operators, do so with the knowledge of what each is providing in terms of a March Madness welcome bonus. Here’s what you need to know about the top online sportsbooks in the industry:

Top March Madness Betting Promos Available Today

It was an action-packed Thursday slate of action, with Virginia and Arizona going down in huge upsets to Furman and Princeton, respectively. What's in store on Friday?

Before you get your bets down on the games, make sure you grab these bonuses to help boost your bankroll and your potential March Madness betting profits. The top March Madness betting promos available for Friday are:

BetMGM March Matchups Betting Promos

Bettors who use the BetMGM bonus code BOOKIESMARCH can get $200 in Bonus Bets from a simple $10 wager on the tournament. Just sign up, enter BOOKIESMARCH as your promo code, then place a $10 bet on a game. You'll get $200 in bonus bets from BetMGM.

Alternatively, use the BetMGM bonus code BOOKIES during registration will receive a first-bet bonus up to $1,000. It’s one of the largest offers on the board and offers insurance of sorts to players on their first wager. Bet on any set of odds in any sports betting market and receive cash profit with a victory or matching bonus bets with a loss. 

Losing bettors will receive five bonus bets in equal 20% denominations of their original wager (for example, a losing $800 real-money wager would yield five $160 bonus bets) so players can spread out their bonuses across bet types and markets to win back their funds. 

Note that a losing original wager of less than $50 will return a single matching bonus bet, which is still a great deal for players who are unsuccessful on their first bet.

Click the BET NOW button below to begin your BetMGM experience and earn your bonus bets.

Up to $1,500 in Bonus Bets if Your First Bet Loses Promo Code: BOOKIES

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Bonus Bets Expire in 7 Days. One New Customer Offer Only. Must be 21+ to participate & present in OH. In partnership with MGM Northfield Park. Gambling problem? Call 1-800-GAMBLER. Visit BetMGM.com for T&Cs. US promotional offers not available in NY, NV, or Puerto Rico.

Up to $1,500 in Bonus Bets if Your First Bet Loses Promo Code: BOOKIES

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Used 64 Times Today

Bonus Bets Expire in 7 Days. One New Customer Offer Only. Must be 21+ to participate & present in OH. In partnership with MGM Northfield Park. Gambling problem? Call 1-800-GAMBLER. Visit BetMGM.com for T&Cs. US promotional offers not available in NY, NV, or Puerto Rico.

Caesars Sportsbook Promo Code BOOKIES1BET

The largest potential dollar amount on the board is the Caesars Sportsbook promo code BOOKIES1BET. All new players will receive first-bet insurance up to $1,250. That means once you place your first bet on the odds of your choosing, you’ll receive either traditional cash profit with a win or a single matching bonus bet on a loss. 

Unlike the teams that lose in March Madness, an Opening Round loss isn’t the end of the world when you’re playing with Caesars Sportsbook. All new players will also earn 1,000 Tier Credits and 1,000 Rewards Credits that can be accumulated while you play and ultimately redeemed for additional perks and offers like bonus bets or even stays at Caesars Entertainment locations.

Hit BET NOW on the link below to qualify for both of these offers with Caesars Sportsbook.

Up to $1,500 in Bonus Bets if Your First Bet Loses Promo Code: BOOKIES

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Used 9 Times Today

Bonus Bets Expire in 7 Days. One New Customer Offer Only. Must be 21+ to participate & present in OH. In partnership with MGM Northfield Park. Gambling problem? Call 1-800-GAMBLER. Visit BetMGM.com for T&Cs. US promotional offers not available in NY, NV, or Puerto Rico.

DraftKings March Madness Betting Promos

Think you can pick the winner of a single March Madness game? It’ll earn you $200 in bonus bets. That’s thanks to the DraftKings promo code offer, which hands out that offer to new bettors who register for an account and place a $5 pregame moneyline wager on any NCAA Tournament game. You'll actually get your bonus bets even if your wager loses. Yea, that's pretty good.

Start your DraftKings betting by clicking on the BET NOW button to earn your bonus bets.

Bet $5, Get $200 in Bonus Bets + No Sweat NBA SGP Every Day Of The Playoffs

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Must be 21+ and present in OH. Gambling Problem? Call 1-800-GAMBLER.

FanDuel Sports Betting Promos

The more you bet, the more you’re guaranteed at FanDuel. The FanDuel promo code offer is pretty simple math: Earn 10x of your first real-money wager in the form of site credit up to $200. 

That means new players who place a $20 bet on any set of odds in any sports betting market will earn the maximum $200 in site credit. We obviously recommend maxing this one out—and you can also earn cash profit on the original wager you place. 

The added bonus here is that the site credit from FanDuel can be used however bettors choose. With so much great college basketball action happening, this is a top-tier offer.

Hit BET NOW on the link below to qualify for this offer and to start your FanDuel experience.

Bet $5, Get $150 in Bonus Bets

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Used 65 Times Today

Must be 21+ and present in OH. Gambling Problem? Call 1-800-GAMBLER.

WynnBET March Madness Promos

At WynnBET, sign up today using the promo code XBDC and get the opportunity for a $100 bonus bet. You earn this $100 bonus bet by placing a $100 wager (or more) on a March Madness game this weekend.

So if you were planning a decent-sized bet on the action, do it at WynnBET and earn $100 in bonuses.

Up to $1,500 in Bonus Bets if Your First Bet Loses Promo Code: BOOKIES

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Used 5 Times Today

Bonus Bets Expire in 7 Days. One New Customer Offer Only. Must be 21+ to participate & present in OH. In partnership with MGM Northfield Park. Gambling problem? Call 1-800-GAMBLER. Visit BetMGM.com for T&Cs. US promotional offers not available in NY, NV, or Puerto Rico.

BetRivers March Madness Betting Promos

All new players at BetRivers get access to a Second Chance Bet worth up to $500 when they sign up using our Bet Now link below. Place your first March Madness bet at BetRivers this week, and if it loses, you'll get your stake back in the form of site credit to try again.

This BetRivers promo works up to a maximum of $500 in bet credits.

2nd Chance Bet Up To $100

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Used 57 Times Today

Must be 21+ to participate. T&Cs apply.