The longest winning streak in NHL history is held by the 1992-1993 Pittsburgh Penguins at 17 games to end the season (though, their last game was a 6-6 tie which would have been win number 18).
The Pens also own the record for most consecutive playoff wins with 11 wins straight in 1991-1992 where they won three straight to end the series with the New York Rangers, swept the Bruins and then swept the Blackhawks to win their second straight Stanley Cup. Their streak actually stands at 14 games however, since the next year in the 1992-1993 playoffs the Pens won three more straight to open those playoffs.
Of additional note, the 1979-1980 Philadelphia Flyers (a.k.a the "Broad Street Bullies") hold the longest undefeated streak (games without a loss) with 35 straight games where they either won or tied. That is a North American professional sports record.
Longest winning streak: Pittsburgh Penguins with 17 straight wins Longest winning streak at home: Detroit Red Wings with 23
the longest winning streak is 48 win-streak by Boston Collage
I believe there longest winning streak was 13 wins
Their longest home winning streak was 14 games
The Blue Jays' longest winning streak was 11 games in 1987 and 1998.
universality of Wisconsin-Whitewater has the longest winning streak in all of college football
2nd longest winning streak is 89 wins from Julio Cesar Chavez
The longest winning streak for the Toronto Blue Jays is 11 wins
Houston Rockets 22 winning streak
Gilles Gilbert holds the regular season NHL record for the longest winning streak with 17 wins in 1975-76.
1992-93 Pittsburgh Penguins
12 games -- Detroit Red Wings from March 1 - April 15, 2006