| 1–3 May | RPT Montana State Poker Championship | Roughrider Poker Tour | Montana, United States |
| 1–10 May | Poker Dream 22 Jeju | — | Jeju, South Korea |
| 5–10 May | Major Series of Poker - The Tour - MSPT Running Aces Regional | MSPT | Running Aces, United States |
| 5–10 May | APC Taipei II | — | Taipei City, Taiwan |
| 6–10 May | Galicia Golden Series Coruña | Galicia Golden | A Coruña, Spain |
| 6–10 May | LNP Winamax Santander | Winamax | Santander, Spain |
| 6–18 May | VPT Championship III | Vamos Poker Tour | Phú Quốc, Vietnam |
| 11–17 May | The partypoker Tour - Madrid | partypoker LIVE | Madrid, Spain |
| 11–18 May | AJPC Samurai Circuit - Taiwan | — | Taipei City, Taiwan |
| 12–17 May | Estoril Poker Fest | Other | Estoril, Portugal |
| 12–17 May | RGPS Passport Pompano Beach | RGPS | Pompano Beach, United States |
| 12–17 May | Major Series of Poker - The Tour - MSPT Michigan Poker State Championship | MSPT | Michigan, United States |
| 12–17 May | Maryland State Poker Championship | Other | Arundel Mills Cir, United States |
| 13–28 May | Triton Poker Series Montenegro | Triton Poker Series | Montenegro |
| 13–17 May | Beyond Junior Zaragoza | Beyond Junior | Zaragoza, Spain |
| 13–28 May | Triton Super High Roller Series Montenegro S5 | TRITON | Montenegro, Montenegro |
| 14–24 May | 888poker LIVE Barcelona | 888poker LIVE | Barcelona, Spain |
| 14–25 May | Grosvenor UK Poker Tour - GUKPT Luton Leg 4 | Grosvenor UK Poker Tour | Luton, United Kingdom |
| 14–24 May | Oklahoma State Poker Championship | RGPS | Tulsa, United States |
| 14–25 May | Unibet Open - UO & UDSO Paris | Unibet Open | Paris, France |
| 15–24 May | The Prophecy Unfolds - GOP Incheon | — | Incheon, South Korea |
| 15–25 May | The Lord Poker Tournament Jeju | — | Jeju, South Korea |
| 18–24 May | Beyond Poker Series Málaga | Beyond Poker Series | Málaga, Spain |
| 19–25 May | Major Series of Poker - The Tour - MSPT Showdown Series Sycuan | MSPT | Sycuan, United States |
| 19 May – 1 Jun | USOP Vietnam HaLong Bay | USOP | Vietnam, Vietnam |
| 20–24 May | LNP Winamax Ondara | Winamax | Alicante, Spain |
| 23–28 May | CPG Satellite Hengqin | — | Zhuhai, China |
| 23–31 May | WPG Taiwan | — | Taipei City, Taiwan |
| 25 May | 25K Fantasy Draft | 25K Fantasy | Las Vegas, United States |
| 26 May – 15 Jul | 25K Fantasy | — | Las Vegas, United States |
| 26–31 May | CEP Madrid | CEP - Campeonato de España de Poker | Madrid, Spain |
| 27 May – 3 Jun | Battle of Malta Summer Edition | Battle of Malta | Malta |
| 27 May – 7 Jun | PokerStars Open Namur | PokerStars Open | Namur, Belgium |
| 30 May – 4 Jun | SiGMA Poker Tour Manila | — | Metro Manila, Philippines |