11 intervening
Indian masters
12 intervening
Indian masters



                  Baso,
Ma Tzu

     Sekito
.
2 intervening
masters
8 intervening
masters
5 intervening
masters
.
2 intervening
masters
2 intervening
masters
Dogen
(Soto lineage)
c. 1300 CE

.
    Kassan
.
Zen Masters in Osho's Talks - A Lineage Chart
Ummon
Ummon's disciples are shown at his other entry, as the disciple of Seppo, in the lower left corner.
6 intervening
masters
5 intervening
masters
5 intervening
masters
.
5 intervening
masters
This chart and related pages are adapted from "Oshobob's" site, LivingWorkshop.net, now "off the air" but preserved at Archive.org. Each name is a Zen Master mentioned in Osho's talks. Names are transliterated (romanized) from their various languages thusly:
  Sanskrit is in bold, Chinese (old format Wade-Giles) in italics and Japanese (Romaji) plain. Those with larger font have whole books dedicated to them. Cover images of those books are scattered around the page.
Rinzai Branch 2
c. 1290 CE
Rinzai Branch 4
c. 1260 CE
Rinzai Branch 1
c. 1200 CE
Rinzai Branch 3
c. 1260 CE
6 intervening masters
An alphabetical list of all the Zen-lineage masters Osho has spoken on in English is here. That list actually has a few more masters than are found in the chart this one is based on, such as the incomparable Kakuan, whose lineage is not known.

Most of Osho's masters are Chinese but emphasis here is given to the Japanese versions of their names, as those are the ones Osho mostly uses. Where he uses the Chinese names, it is per the now fairly obsolete Wade-Giles system, so that usage is followed here. Modern Chinese (Pinyin) versions are found for all in the linked pages, along with a brief bio-history and Osho quote. In many of those linked pages, Oshobob has altered the names in Osho's quotes to the Pinyin versions of the original Chinese names.
And he has created another more Chinese Chan-oriented lineage chart with names all in Pinyin, including all the missing intervening masters plus many more. A significant anomaly that emerges comparing that chart with the original chart of Zen masters in Osho's talks regards the Rinzai lineage(s) leading to Japan:

The original Osho's talks-oriented chart shows only one Rinzai line leading to Japan, going through Engo and Ta Hui, and then directly into Japan. The Pinyin chart shows four rather lengthier Rinzai lineages leading to Japan, with none of them including Ta Hui.

A view has been taken that, at the very least, the "original" one featuring only Ta Hui is simplistic and misleading, as the individual masters' bios consistently reflect the Pinyin chart's version. Ta Hui had many realized disciples and very likely some of them down the line went to Japan, but:

1. His time predated the historically documented migration by at least fifty years and
2. His disciples and lineage are not documented as well as the others in terms of dharma transmission, especially in Japan.

The Pinyin chart's version has accordingly been allowed provisionally to subsume the original chart's Ta Hui version. Both charts agree that the Soto line entered into Japan via Dogen.
Zen
Masters
in
Japan
This chart is by necessity oversimplified regarding actual lineages. Many of the masters shown were disciples of two or more masters but are mostly shown connected with only one. And many of the masters shown with no enlightened successors may have had many, and well connected to others in the chart who came later, though that is far from obvious. One example might be Sozan (Caoshan), who is shown as "dead-ending", but in his
  individual bio-page is said to have co-created, with his master Tozan (Dongshan), an entire major lineage, Caodong, which became Soto in Japan. This could of course be a mis-placement, and he should be where Ungo is, but as it is, it is consistent with the Chan chart and both their bio-pages, so for now, we can call it just an over-simplification.

4 intervening
masters
Oshobob has also written a splendid, detailed history of the derivation of the word "Osho", which can be found here.
Osho has of course spoken on many Zen masters in Hindi as well. Since no handy reference exists for these mentions, the above book on Buddha is here to represent them all.