Sigma Sigma Omicron (ΣΣΟ) was a national collegiate sorority operating under that name in the United States from November 1, 1920 to 1927. It has had several successor names.

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This sorority existed for approximately 13 years. For more than half that time it was known as Sigma Sigma Omicron, with the name Sigma Phi Beta adopted during its final six years. The Alpha chapter of Sigma Sigma Omicron was formed on 1920-11-1 at New York University, eventually chartering five chapters, mainly at teachers colleges. Its primary founder was Vera Bartone Goelier, supported by other students of the junior, sophomore and freshman class. On 1927-07-28 the sorority changed its name to Sigma Phi Beta (ΣΦΒ), in anticipation of a merger six months later with the three chapters of Phi Alpha Chi, which it effected on 1928-01-07 after "find[ing] their interests and purposes similar...". Phi Alpha Chi had its origin as The Tanewah Club in 1919 at Berkeley. In 1926, the Tanewah Club first adopted Greek letters, reorganizing as the Alpha chapter of Phi Alpha Chi. Delta Zeta's history (1983) recorded that Sigma Phi Beta absorbed Phi Alpha Chi before combining five years later under the Phi Omega Pi banner in 1933. According to the 1931 edition of The Sorority Handbook there were 10 active chapters of Sigma Phi Beta, with 1,000 members (p. 79). Baird's Archive lists 15 chapters. On 1933-10-01 Sigma Phi Beta merged into Phi Omega Pi, which itself was later (but only partly) absorbed by Delta Zeta in 1946, with some chapters disbanded or released to other sororities.

Insignia and Traditions

Chapters

These are the chapters of Sigma Phi Beta prior to the merger with Phi Omega Pi in 1933. Baird's reports that 15 were installed, with ten surviving to participate in the merger. However, records list eight that definitely merged, with one more possible. Known active chapters at the time of the merger are listed in bold, inactive chapters listed in italics.

Phi Alpha Chi chapters