The most famous one is the Little Bar:

Little Bar
Category: Lounges
757 S. La Brea Ave
Los Angeles, CA 90036
(323) 937-9210
www.littlebarlounge.com

From what I've heard from reviews, this one is exclusively for Boston sports fans, it is very popular in the LA area, and the atmosphere is very cozy, and the place has an Irish bar feel to it.

Here is what a reviewer said.

Quote
Came in right AFTER a Sox game ended, so it was nearly dead the entire time (10pm - late on a Thursday eve) - had no idea there was a Boston themed (or is it New England??) bar in my 'hood. Very excited for future sporting events (GO CELTICS), although their tv's are less than sports-bar-fantastic ... moderate prices, solid beer list. Still don't know what Soju is, but that's cause im too meek and timid to ever ask a bartender.

Calm, neighborhood-y vibe where no one is really in anyone else's business. 80's music DJed all night - don't know if its a weekly Thursday thing or just a special event, but I dug it.

Shockingly NORMAL for LA. Ya know? Not too pretentious, not divey, just .... a smallish bar . Where they serve booze. And you drink it
End Quote
Source(s):
http://www.yelp.com/search?find_desc=boston+bars&find_loc=Los+Angeles,+...

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One of the best Boston sports bars in Los Angeles is Boston's Restaurant and Sports Bar.

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"Boston's Restaurant and Sports Bar
11260 Fourth St., Rancho Cucamonga, CA, 91730
(909) 758-9115

Boston's Restaurant and Sports Bar restaurants offer a contemporary, lively atmosphere and a separate-seating sports bar customized with memorabilia of favorite teams. Restaurants feature big screen TVs with satellite dishes and Pay-Per-View to showcase sports and special events. The result is a high-energy."

-end of quote-
Source(s):
http://events.dailybulletin.com/rancho-cucamonga-ca/venues/show/663732-bost...

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