Jake Allen Guentzel (born October 6, 1994) is an American professional ice hockey player who is a left winger for the Tampa Bay Lightning of the National Hockey League (NHL). He was selected in the third round, 77th overall, by the Pittsburgh Penguins in the 2013 NHL entry draft, and won the Stanley Cup with the Penguins in 2017. Guentzel has also previously played for the Carolina Hurricanes.

Guentzel was born in Omaha, Nebraska on October 6, 1994 and grew up in Woodbury, Minnesota. He played two years of varsity hockey at Hill-Murray School in Maplewood, Minnesota, with the school's team finishing second in the 2012 MN State Hockey Tournament.

Guentzel joined the Sioux City Musketeers of the United States Hockey League (USHL) for the 2012–13 season, recording 29 goals, 44 assists for 73 points in 60 games. He finished sixth overall in the league in scoring and was voted the USHL Rookie of the Year as well as being named to the USHL All-Rookie Team. He was also named to the league's Second All-Star Team.

Guentzel committed to play for the University of Nebraska Omaha (UNO), a National Collegiate Athletic Association (NCAA) Division I college hockey program. He joined them for the 2013–14 season. In his freshman year with the Omaha Mavericks, Guentzel was named to the National Collegiate Hockey Conference (NCHC) Academic All-Conference Team, the NCHC All-Conference Rookie Team and was a finalist for NCHC Rookie of the Year. He recorded seven goals and 34 points in 37 games with the Mavericks that season. In his sophomore season in 2014–15, he helped guide the Mavericks to their first showing in the Frozen Four, scoring the team's only goal in a 4–1 loss to the Providence Friars. He finished the season with 14 goals and 39 points in 36 games as the team's leading scorer. On August 27, 2015, before Guentzel's junior year in 2015–16, he was named a co-captain along with Brian Cooper after a vote by the team. He appeared in 35 games, marking 19 goals and 46 points, finishing as the team's leading scorer for the second consecutive year. He was named an NCHC Scholar-Athlete and a member of the NCHC Academic All-Conference Team along with being named to the NCHC All-Conference Second Team. He decided to forego his senior year with UNO to turn professional.

Guentzel was selected by the Pittsburgh Penguins of the National Hockey League (NHL) in the third round, 77th overall, of the 2013 NHL entry draft. He first signed an amateur tryout contract with Pittsburgh's American Hockey League (AHL) affiliate, the Wilkes-Barre/Scranton Penguins (WBS Penguins) in March 2016 and helped them qualify for the 2016 Calder Cup playoffs. He finished the regular season making 11 appearances with WBS, scoring two goals and six points. The Penguins advanced to the second round, where they were eliminated by the Hershey Bears in their best-of-seven series. In ten playoff games, Guentzel added five goals and 14 points, leading the team in playoff scoring. Guentzel signed a three-year, entry-level contract with the Pittsburgh Penguins on May 23, 2016.

Guentzel began the 2016–17 season in the AHL. He was recalled by Pittsburgh on November 16, 2016, after an injury to Chris Kunitz. Guentzel made his NHL debut on November 21, against the New York Rangers; he scored two goals on his first two shots. Despite this, the Penguins lost the game 5–2. He appeared in five games for Pittsburgh, recording three goals and four points before being returned to WBS on December 16. Guentzel was selected for the 2017 AHL All-Star Classic alongside teammate Tristan Jarry. Pittsburgh recalled him again on January 17, 2017, after he recorded 21 goals and 42 points in 33 games in the AHL. On March 21, Guentzel suffered a concussion on a check from Buffalo Sabres defenseman Rasmus Ristolainen. He missed the next four games, while Ristolainen was suspended by the league for three games. He finished the season with Pittsburgh, scoring 16 goals and 33 points in 40 games total. The Penguins qualified for the 2017 Stanley Cup playoffs and faced the Columbus Blue Jackets in the first round. On April 16, he scored a hat-trick, which included the game-winning goal in overtime, to put the Penguins up 3–0 in their series against the Blue Jackets. He became the first Penguins rookie to score a playoff hat-trick, and only the second rookie in NHL history to score a hat-trick and overtime goal in the same game of the playoffs. On June 11, 2017, the Penguins won the Stanley Cup after defeating the Nashville Predators in six games. During the run, Guentzel recorded 21 points, tying Dino Ciccarelli and Ville Leino for points by a rookie in a single postseason. His total of 13 goals was one shy of Ciccarelli's record. He was also named to the AHL's 2017 All-Rookie Team alongside teammate Casey DeSmith.

Guentzel began the 2017–18 season in the NHL, putting up a career high 48 points in 82 games to help the Penguins qualify for the 2018 Stanley Cup playoffs. During the first round of the playoffs, Guentzel recorded four goals in an 8–5 Game 6 win over the Philadelphia Flyers. He became the third Penguins player to record four goals in a playoff game, behind Mario Lemieux and Kevin Stevens. Advancing past the Flyers, they were eliminated by the Washington Capitals in six games in their best-of-seven series. In all 12 playoff games, Guentzel scored 10 goals and 11 assists for 21 points.

The 2018–19 season marked the last year Guentzel was on his entry level rookie contract. The Penguins began the season with a slow start, landing near the bottom of the league in early November. On November 24, 2018, Guentzel recorded his first regular season hat trick in a 4–2 win over the Columbus Blue Jackets. The following month, on December 27, the Penguins re-signed Guentzel to a five-year, $30 million contract. Guentzel recorded his second regular season hat trick in a 7–4 win over the Anaheim Ducks on January 11, 2019. His hat trick was the first by a Penguins player ever against the Anaheim Ducks. After a two-goal game the following night against the Los Angeles Kings, Guentzel was named the NHL's Third Star of the Week. He recorded a four-point game on March 2, scoring two goals and adding two assists in a 5–1 victory over the Montreal Canadiens. He finished the regular season with 40 goals and 76 points in 82 games. The Penguins made the 2019 Stanley Cup playoffs and faced the New York Islanders in the first round. However, the first line, of which Guentzel and linemate Sidney Crosby were the key components, failed to score, and the Penguins were eliminated in a four-game sweep. Guentzel scored just once in the series.