Top iGaming Markets in the World by Size

The global online gambling market generated between $92bn and $130bn in gross gaming revenue in 2025, depending on the estimate and what is counted. The range itself tells a story. Some research firms include grey and black market activity in their figures. Others count only licensed, regulated revenue. National regulators in several major markets still do not publish online-specific GGR data at all, making estimation unavoidable.

What is not in dispute is the direction. The market grew by double digits year-on-year, mobile now accounts for the majority of sessions in most jurisdictions, and sports betting continues to outpace casino in volume terms globally. Europe alone generated €123.4bn in total GGR in 2024, with online channels accounting for 39% of that figure, up from 37% the previous year.

This ranking lists the 25 largest online gambling markets in the world by GGR, drawing on regulator filings, government agency reports, and reputable industry research. All figures are in US dollars and cover the 2024 calendar year or the latest available fiscal period. Where a market’s regulated revenue significantly understates actual activity due to a large illegal segment, that is noted.

The Top 10: Markets Above $2bn in Online GGR

The United States stands in a category of its own. Online-only GGR reached $27.1bn in 2025, combining $10.74bn from iGaming and $16.37bn from sports betting. That figure comes from just eight states with legal iGaming and 32 with legal sports betting. The AGA reported total commercial gaming revenue of $72bn in 2024, meaning the online segment now represents a rapidly growing share of a market still dominated by land-based casinos in Nevada, Atlantic City, and tribal operations across the country.

The United Kingdom, long the benchmark for regulated online gambling, generated approximately £7.8bn in online GGY in the year to March 2025, equivalent to roughly $10bn. The UK’s confirmation of major gambling tax increases in late 2025, with online casino duty rising to 40% and sports betting to 25%, puts the market at an inflection point. Operators including Flutter, Entain, and Evoke have all flagged the tax burden as a material headwind.

Brazil’s entrance into the top three is the year’s most significant development. The country generated BRL 37bn ($7bn) in GGR in its first year of regulated operation, with 79 licensed operators and 25.2 million active bettors. The federal government collected BRL 10bn in tax revenue. The illegal market remains substantial, estimated at 41% to 51% of total activity. Ongoing tax debates and a proposed advertising ban add uncertainty to the outlook.

Italy and Germany both sit at $5.5bn, though through very different market structures. Italy’s figure reflects a mature, tightly regulated framework with 81 licensed operators and €92bn in online turnover. A new licensing regime launched in 2025 with 52 active permits and a €7m licence fee. Germany’s figure is more contentious. The GGL reported €3.3bn in legal online GGR, but H2 Gambling Capital estimates that only 40% of the total market is channelised, placing real online activity closer to €5bn to €6bn including black market turnover.

Australia rounds out the top six at $5.2bn, a market where online casinos remain banned for domestic players. Legal online activity is limited to sports betting, racing, and lotteries. Canada’s $4bn total is driven primarily by Ontario, which alone generated CA$3.2bn in its 2024/25 fiscal year across 84 websites and 49 operators. Traffic data shows Stake.com drawing 21 million Canadian visits in a single month, exposing the gap between regulated and offshore activity.

Romania at $3bn is one of the more surprising entries. BNR card payment data indicates €2.5bn in player spend via online card payments in 2023 alone, representing 12.5% of all online card transactions in the country. With ONJN collecting €865m in tax revenue in 2024, the market is larger than many Western European counterparts. France comes in at $2.9bn despite not allowing online casino. Sports betting generated €1.8bn of the total, up 19% year-on-year, across just 14 licensed operators.

Markets Ranked 11 to 25

Spain’s online gambling market hit €405m in GGR in Q3 2025 alone, and the full-year 2024 figure of €1.45bn represented a record for the country. Casino overtook sports betting as the primary revenue driver, a structural shift that aligns Spain with broader European trends.

Spain’s Online Gambling Market Hits €405M GGR in Q3 2025 as Casino Dominance Grows

Sweden maintains one of the highest online penetration rates on the continent at 64% of total gambling revenue, though the market is under pressure from rising taxes. ATG’s CEO stepped down in early 2026 amid declining revenue linked to tax increases.

ATG CEO Steps Down as Swedish Operator Reports Revenue Decline Amid Tax Hike

The Netherlands presents a cautionary example. Despite generating €1.47bn in online GSR, the KSA’s own data indicates the illegal market accounts for roughly half of all player spend. The Dutch regulator warned in February 2026 against gambling normalisation as social attitudes shift, adding a political dimension to the market’s growth trajectory. Just 22 permit holders operate in the regulated space.

Portugal at $1.2bn delivered 32% year-on-year growth, one of the strongest rates in Western Europe. Colombia, the first Latin American country to regulate online gambling in 2016, has established a stable base at $0.8bn with operators including Betplay, Wplay, and Codere active in the market.

At the lower end of the ranking, Finland stands out as a market in transition. The Veikkaus state monopoly is set to give way to an open licensing framework by July 2027, with approximately 20 operators already applying for licences. Chile remains a grey market with regulation pending, while Kenya’s mobile-first betting ecosystem faces sustained pressure from high tax obligations.

Notable Exclusions: Banned Markets With Large Activity

Three markets warrant mention despite their exclusion from the main ranking. India banned all online real-money gaming in August 2025 under the Promotion and Regulation of Online Gaming Act. The market was estimated at roughly $2bn prior to the ban. Japan’s criminal code prohibits online gambling, but an estimated ¥6.4 trillion ($41bn) was wagered on overseas sites in 2024, a figure that dwarfs most regulated markets. The Philippines permanently banned offshore gambling operations in October 2025 under the Anti-POGO Act, but domestic online gambling through PAGCOR remains legal and generated PHP 114.83bn ($1.9bn) in just the first half of 2025.

Market Trends Shaping the 2026 Outlook

Tax pressure is intensifying in mature markets. The UK, Sweden, and Germany have all implemented or proposed higher duties on online gambling revenue. Flutter estimated a £540m impact from UK tax increases alone, while Entain projected £200m in annual additional tax costs. These figures are reshaping operator economics and accelerating consolidation.

Flutter Entertainment Faces $540M Impact from UK Tax Increases on iGaming and Sports Betting

Channelisation remains a persistent problem. Germany and the Netherlands both report that roughly half of online gambling activity occurs outside the regulated market. Even Brazil, in its first regulated year, estimates 41% to 51% of activity is unlicensed. The gap between legal frameworks and actual player behaviour continues to challenge regulators across every continent.

Latin America is the fastest-growing region by market formation. Brazil’s entrance at $7bn, combined with Argentina ($1bn), Colombia ($0.8bn), and Chile ($0.5bn in grey market activity), positions the continent as the primary source of new regulated GGR over the next three to five years.

Mobile dominance is now universal. Research firms consistently report that smartphones account for 55% to 72% of all online gambling sessions globally, with the figure exceeding 80% in mobile-first markets like Nigeria and Kenya. This has implications for product design, payment infrastructure, and regulatory approaches to player protection.

Europe’s five key iGaming regions continue to account for the single largest share of global regulated online GGR. The continent held between 42% and 57% of the global market in 2025, depending on the research source. But that share is declining as the US scales and Latin American markets mature.

Europe’s 5 Key iGaming Regions: Operators, Traffic and the B2B Stack

Where Market Size Meets Commercial Reality

The ranking makes one point clearly: market size and regulatory maturity do not always correlate. Brazil generated $7bn in its first regulated year while Germany, with years of regulatory debate behind it, still channels less than half its market. Romania generates more online GGR than Spain, and France restricts its operators from offering online casino entirely yet maintains a $2.9bn market on sports betting and poker alone.

For operators and suppliers evaluating where to allocate resources, the raw GGR number is only part of the picture. Tax rates, licensing costs, channelisation rates, and the size of the illegal market all determine whether a high-GGR jurisdiction is commercially viable. The UK generates $10bn but takes 40% of online casino revenue in duty. Brazil generates $7bn but carries regulatory uncertainty and a large unlicensed segment. The markets that will reward investment in 2026 and beyond are those that combine growing GGR with stable regulation and credible enforcement against unlicensed operators.

Methodology: GGR figures are sourced from national gambling regulators and government agencies where available, supplemented by industry bodies (AGA, EGBA) and market research firms (H2 Gambling Capital, Regulus Partners). Exchange rates are approximate 2024 averages. All figures represent online-only GGR unless otherwise noted.