My longest losing streak just stretched to 0/14 in the past two days regardless of what champion I pick, who I play with, or if my team comp is good or bad, if I do good or bad. Now, what is your longest losing streak? 
It was 13 losses in a row recently. I've been playing with positive stats, but unviable roles and builds like AP Varus, AP Corki, bot Cait, top Urgot, top Mundo, top Gnar. I had a lot of 4v5 games too. Then I started playing bot Jinx, top Ryze, mid roaming Katarina and suddenly I'm on the winning streak.
I never have losing streaks, you lose one game quit for a while then get back to playing with a positive mindset.
~6 ranked games and 20 normals :l
I've lost my last 8 ranked games, over the course of 2-3 months. Never more than one a day.
For normals, I think it's been around 9 games in a row.
I think my longest losing streak was maybe 10 games?
I guess its true what they say, a win streak is followed by a much longer losing streak. I won 5 in a row, 7 of 8, 12 of 16 or something like that. After that I lost 6 in a row. You're probably thinking, that's not so bad, is it? Well that's not the whole story. I have lost 15 of 18. This is currently active. I know its not a streak since I have a few wins in the middle of it. Also I forgot to mention that in the 6 straight losses, 5 of them had trolls not kidding. I think 4 of the 5 troll games were AFKs and 1 was just my idiotic adc and jungler yelling at us for mistakes even though they were doing just as bad.
ranked or norms? my longest overall was 12
My longest ever was 69 losses, with 1 win in the middle of that. but yeah it was horrible.
