Louis Frederick Angotti (born January 16, 1938) is a Canadian former professional ice hockey player and coach.

Angotti grew up in Toronto and played his junior hockey for the Toronto St. Michael's Majors. He then enrolled in Michigan Tech University where he earned an engineering degree while skating on powerful college clubs. He appeared in two NCAA championship games, losing the 1960 game while winning in 1962. He was MVP of both tournaments and was All-WCHA First Team for 1961-62.

Angotti signed with the New York Rangers, playing two seasons with the minor league Rochester Americans before being called up to the big league club in 1964-65. Angotti quickly became known for his high-energy, speedy play. Over the next nine seasons, he would play with the Chicago Black Hawks, Philadelphia Flyers, Pittsburgh Penguins, and St. Louis Blues. He had his best offensive season in 1967-68 with the Flyers, when he scored 49 points while serving as the club's first ever captain. During his second stint with Chicago (from 1969 through 1973), he served as a key defensive component on a team that narrowly lost two Stanley Cup Final series.

During his final season with the Blues in 1973-74, he was hired as coach after Jean-Guy Talbot was fired with 23 games remaining in the season. He retired to serve as head coach on a full-time basis, but, after he was fired just 9 games into the next year, he returned to play hockey with the Chicago Cougars of the WHA. Angotti again served as head coach during the 1983-84 seasons, this time with the Pittsburgh Penguins.

Angotti has also coached the New Brunswick Hawks, Erie Blades, and Baltimore Skipjacks of the AHL for one season each. He does periodic work on behalf of the Blackhawk Alumni Association.

Following his playing career, he was a color commentator for Chicago Blackhawks games on WSNS-TV and WCFL radio.