Twitter announced a range of live-streaming video deals on Monday evening during a “NewFront” sales presentation its executives made to marketers in New York.

The social network unveiled partnerships with companies such as BuzzFeed, Vox Media, MLB Advanced Media and Live Nation to produce or provide live-streaming content for the platform.

BuzzFeed will create a news and current events show to be broadcast live on Twitter each morning, for example, while Vox Media will create a weekly live show dedicated to gadgets called Circuit Breaker, Twitter executives said.

In the sports arena, WNBA will live-stream 20 regular-season games via the platform, and MLBAM will produce a new 3-hour weekly MLB program featuring game “look-ins” and highlights.

The announcements come as Twitter attempts to reposition itself as a venue for professionally-produced live video content and tap into advertising budgets typically reserved for TV.

Elsewhere in the news arena, Twitter is joining with Bloomberg, which will launch a 24/7 live-streaming channel with content produced solely for the social platform, The Wall Street Journal reported Sunday.

Twitter said it streamed more than 800 hours of live video in the first quarter of 2017, compared with 600 hours the previous quarter.

Meanwhile, rival platform operators Snap Inc. and Facebook Inc. are also encouraging users to watch as much video as possible on their respective platforms, and are licensing both live and non-live video content to help fuel that consumption.

Other live video content will be published on Twitter by Cheddar, Bloomberg Media, The Players Tribune and PGA Tour, Twitter said.

—Georgia Wells contributed to this article.

Write to Jack Marshall at Jack.Marshall@wsj.com